I'm brand new to ereaders having only bought my 505 on friday, I've found it slightly worse than paper to read however the convenience more than makes up for it.
I work offshore on oil rigs an awful lot and the weight restriction on the helicopters is normally 10kg, due to the nature of my job i can spend a lot of time sat around reading however due to weight 2 paperbacks is my limit

Which dependant on the job only last about 4 days into a 2-3 week trip I fly off again on thursday and my reader will be loaded up ready to go. I wish there where more titles available however i'll take what i can get right now and still buy real books when i can't find the ebook version. So yes readers aren't perfect but they solve a massive problem for me and make the pleasure of reading more accessible plus i'm not waiting for deliveries of books