6:57 a.m. on August 11, 2012 (EDT)
Hey dm1333, how are ya?
So, looks as though you are in the market for a UL solo shelter. As maxx has stated I do own the Copper Spur 1.
If you have not had the opportunity to see it yet I did review this model here on Trailspace. It is a great 1 man tent. Vents very well, shed rain well, quite roomy(my opinion) blah blah blah. Most of what I could tell ya here is contained in the review itself so I don't know if it is really necessary to rehash it all again here.
I was just looking at the Rainbow again(it was on my short list when I purchased my Spur) and a few things stood out to me.
The biggest thing is how high the floor extends. My primary worry with this is if you are caught in a real wash out of a storm the splashing effect could be an issue.
With the Spur the fabric above the bathtub floor may give you a bit of added protection should you find yourself in a really harsh hammering rain storm.
I actually treat this area of my Spur w/Nikwax Tent & Gear Solarproof to add a little more wet weather protection(rain seems to like me and follow me alot(bheiser will probably comment on that if he sees this. :)
Another thing you may want to consider is the Rainbow is essentially a single wall shelter. So on a clear night if you want to lay in your tent and star gaze you are somewhat dead in the water unless you sleep outside your tent.
You can pitch the inner alone on the Spur at which point the only purpose it will serve is to keep the creepy crawlies off of ya.
Also as stated in the review you can fast pitch the Spur with just the footprint and fly which will drop the weight down to 2.2lbs. I typically do this in the early fall.
I do like bugs(as well as all critters) but I have had an experience where I found a Brown Recluse making its way to try and make a home with me so for that reason I typically use the inner as well.
The above is one of the main reasons I do not like using trail shelters.
On the condensation subject...
As I stated the Rainbow is essentially a single wall shelter. So with that being said condensation could be an issue. Then again this is all relative to when you are going to use the shelter, what steps you take to negate this issue, what type of bag you are using and most of all what seasons you are using the tent.
The colder the temps, the more condensation becomes an issue. My worry is that the footbox of your bag could become "damp" from making contact with the tent.
Typically when condensation occurs the moisture will make its way to the inner of the fly. With a double wall tent this isn't much of a problem being your bag won't make contact with the fly being the inner won't let it do so.
With a single wall shelter the outer tent is also your inner tent so there is no space between the 2(bag & outer.)
As I stated this is more of a problem in colder temps so this would all be relative to your own personal use.
I have not used the Rainbow so the above is based on experience with other single wall shelters, so on and so forth. Then again for me a double wall is the way to go because humidity levels here can be completely bonkers at times.
On the whole misting thing I have had times where I thought the Spur was misting. This was typically in an extended downpour in high humidity conditions. What I came to realize was the condensation that accumulated on the inside of the fly & the poles was being hammered from the outside by the rain and it was causing it to mist in a sense. It wasn't a big deal, and to be honest with ya I hardly noticed it. I only noticed it when sitting up during a downpour. Mind you when I mean downpour I mean a 6hr+ deluge that resulted in me having a zero day on trail.
I watched the video for the Rainbow and something kind of stood out to me. If you watch the video when the gentleman utilizes his trekking poles for a horizontal pitch it looks as though there is a good amount of stress on the poles being there is a "bow" to them.
Here is that video(I can't post the actual video but here is the link:)
See setup:
http://www.tarptent.com/rainbow.html#videos
I am not quite sure that I would utilize my trekking poles for this type of use. I mean I am pretty rough on my gear and I use my gear alot. The extra added stress generated from the bowing of the poles just seems somewhat unnecessary to me. I am just leery of having my poles bent like this for hours on end. It would be my luck that this would cause a problem in the shafts or locking mechanisms that could be a potential headache on the trail.
Vertical pitch should be fine though.
I am not knocking the Rainbow. It is a sweet little rig. It just depends on what abilities you want out of your shelter which varies from individual to individual.
There are trade-offs w/both models just like there is with pretty much all gear.
Its basically a pick your poison scenario.
I would like to mention for 2012 BA 86d the small pass-thru door opposite the entrance that is covered in my review to shave more weight from the Spur.
Is this a deal breaker? Nah, but I have to say I am a fan of having this little storage area for my boots, a Nalgene, or other small items as stated in the review that I wrote.
Either way I hope I may have helped you a bit. If you have anymore questions that I may have not covered feel free to fire away.
Happy hiking.