One piece of gear that has really impressed me is the RTT. I wasn't loving it the first 3-5 times I took it out. I didn't know how to set it up quickly, and it was cold in the winter. Now that I've put a good 15+ nights in it, I absolutely love it for multi-day camping. For single overnighters, I don't think it'd be worth the $ over a good ground tent. The convenience of having all my gear up in the tent and not in the back of the truck is the main reason I love it. I can keep my pad, bags, and pillows in the tent, which keeps all my bedding dry no matter the conditions.
My wife loves it too. I really am surprised at how much I love having the RTT. The only other solution I'd look into is a flip-pac rear shell. Those are sweet. I haven't been around them much to know their pros and cons, but I love how much room they have, and how much storage you get with one. Then again, they're about 3x the cost of a RTT, so until I have a family big enough to outgrow the RTT, I don't plan on getting one.