Yeah I bought the abyssus like a week ago, still trying to figure out the "milestones" for getting a consistent grip :)
To be honest this is the best mouse I've ever had, and I had a few (G400, FK1, DA, Kanav2, G100s, some a4tech x7). I've never used side buttons tho, and I've got no problems with using the mouse on 1800 dpi (no built-in memory in abyssus), got small hands and like lightweight mice, so this one is just perfect for me. Also the switches on abyssus are extremely nice, so tactile :O (I'm a switch addict, if there's anything that bothers me during clicking, it makes me hate the mouse). The only ones that felt better were those on G400.
The only thing that bothered me on abyssus was a pretty high lod but got used to it in no time. Btw I'm clawing the abyssus, never tried to palm it, dunno if it's comfy to palm it. If there's anything else you'd like to ask feel free to pm me. I can even provide you some photos with my Abyssus and G400 compared on them. (still got my G400 somewhere around ;))