I use both because apparently I like to waste money. I have dual 20" and 24" hooked up on my desktop (which has a totally sweet humanscale keyboard tray) as wel

I use both because apparently I like to waste money. I have dual 20" and 24" hooked up on my desktop (which has a totally sweet humanscale keyboard tray) as well as a 12" thinkpad tablet. When I'm sitting at my desk, I feel pretty awesome, I can fill my screens with whatever I'm working on etc. If I for some reason want to work outside or need to meet to discuss something the thinkpad is decent-ish (1400x1050 resolution) for coding and note taking. I will admit I don't understand the need to lie on the couch and code. I feel like its best to separate out tasks and the places they are performed. When I'm sitting at my desktop I am either playing a computer game or programming. If I'm lying on the couch I'm watching TV. Typing on the couch seems hell on the wrists. (And doing so in bed hurts the quality of your sleep). (Sidenote: I worked at a startup where I just brought in my thinkpad. I ended up borrowing a spare monitor, keyboard and mouse just so I wouldn't go crazy. I felt like I couldn't fit any code on my screen otherwise.)