I've done some. It's a lot like everything else gear wise. If you want small, lightweight and good, its going to cost a lot of money. You can get small, lightweight and cheap, and it may be okay for temperate weather and occasional use, but it probably will be too hot or too cold and fall apart with constant use. I know from your previous posts that you are not long on cash, so I'd recommend you ask around here and your extended network of friends and acquaintances to see if they maybe have something good, small and high quality sitting in their garage not being used.
There are an almost infinite variety of tent characteristics. I am assuming you want, in order:
1) Small size when packed up.
2) Low weight.
3) Big enough for you to lay down inside of it, but not to live in it, eat in it, or play cards in it.
4) Heavy enough to keep the rain off, but not heavy enough for "winter" (read cold and/or snow) conditions.
5) Durability. Should last six months? with constant use. (This is rare for typical economy family camping products, much of which is almost disposable.)
6) Minimal stakes, poles, fly ties, etc. (Ideally, none.)
7) Minimal setup. takedown and packing hassle.
You can see a number of decent options that will meet these criteria to varying degrees here:
http://www.rei.com/category/4500029 at prices ranging from $120 to $400 and up. Be aware that the cheaper ones will probably look no worse than the pricier ones. The difference will be in the fabrics, the weight, the sewing, the ease of setup, the parts, etc. There are reviews on this site that might be helpful as well.
Camping is one more reason it's better to do this when you are 25 than 50. The thrill of sleeping on the ground in a tent wore off for me about 25 years ago. I don't even sleep that good in my own bed anymore.