I almost bought an IKEA couch without trying it,but I managed to buy one at a local store for not much more. A few weeks later I found my self at IKEA and tried out the couch. I was so glad I didn't buy it, all of them were so uncomfortable.
I got my sofabed from Ikea. It looks good to me and is an absolute joy to lie on. The few guests that have slept on it gave 5/5 reviews, firm feel and well slept.
Granted, it's just six months old so I don't know yet how it'll hold up. But I'm very happy this far.
R2G was, by far, the best option. I know that the sofa is "cheap" compared to what a "quality" couch would cost. (I paid $3200 for a three piece sectiona.) However, going into the showroom, having oodles of oodles of styles we could sit on, and giving the salesperson my card and having them take care of literally everything else (down to installation and placement) was amazing. The couch also looks great and is comfortable as hell.
The thrift shop couch was the second-best experience. Terrible selection, but we got lucky in finding a couch we liked. As it happens, the couch was an Ashley Furniture couch, which is kind of like R2G. We had to move it in ourselves, which was extremely annoying. But it is still standing and is still a great couch. (It's my office couch now!)
The IKEA couch was by far the worst. Buying the couch was easy, of course. Putting it together sucked, but whatever. The quality of the couch, though, was a disaster. Super lumpy seats within months of use, color stains discolored the couch permanently, even after cleaning, looseness, etc. I wouldn't buy couches from them again.
That said, we have tables from them that are still great. So maybe IKEA for small furniture you don't care about is the move.