I stitch exclusively on lap/floor frames, and have for many years. I found that my work never came out as neatly as I wanted it to, using hoops, and later, qsnaps. I find that my tension is neater, and my fabric stays cleaner. Stitching is also much, much faster because you can use the two handed method.
I own two K's Creations Adjustable lap frames (the medium and the large), and used them for nearly ten years. All K's products come with a lifetime warranty, and I can tell you that their customer service is top notch! I only recently purchased a floor frame from someone else because K's didn't make a big enough frame for what I needed.
For my really big projects (like Golden Kite's or HaEDs), I prefer my Mark II floor stand, by Hearthside Craftworks. The pricetag is pretty hefty on this one, but I can tell you that no serious stitcher should be without one.
For pictures of both stands, you can refer to my deviantart account. It's under the same user name.
Please feel free to ask me any questions you may have!