I bought an RV4 at Overland Expo; it was a demo model they were staying in during the event. So far, no issues to report other than it attracts a lot of attention when you set it up around other people.
We're starting to build a following among our LR club for these things. I first got interested in one about a year ago when I saw another guy roll into camp late and set his up in about a minute.
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One friend recently bought an JV Sig. edition with all the options; full floor/side panels/etc. He went this route as he's tall and the main body of the tent basically becomes his storage area and he 'lives' in the high-peaked front area. Unfortunately, the first time he put it up was in the dark at a campsite and he managed to break one of the plastic hinge/slide pieces. It was also something of a PITA to assemble all the additional pieces. It would be good for base camping, but putting all the extras together seemed like too much work for just one night then moving on. Of course I'm sure it all goes a lot smoother for him now that he's done it a few times.
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The only 'complaints' I have about mine is that although you can indeed put the basic tent up in a minute or less, it does take a little longer to put the rest of it up. By the time I stake out the fly, awning, etc it's no longer the '30 second tent' by any means. It's still faster than my little Big Agnes backpacking tent or my REI Hobbitat, but it ain't no 30 seconds. And of course the other drawback is the sheer size/weight of the thing. Granted, I have the big RV4 because I wanted lots of room (and it does deliver) but without a rack to put it on there's simply no way to carry it in the average SUV or short bed truck. I don't know if my wife could even load the thing on top of the rig herself.
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Going to take it out snow-camping at about 7000' at the end of the month. Can't wait to see how it does in some real cold.