I got a spyder E-99 and i have no complaints. its a very very good beginner gun. easy to maintain, easy to use, easy to clean. Its a good gun to help you get accustomed to the basics of gun upkeep (least i think so), and its a good gun for rec ball play. Since i havent been to a tournament (playing in my first one next month) i dont know how it stacks up to tournament play, but i cant see why it wouldnt be all that good. unless you come across the i like to spray and the E-99 only gets up to 13 bps.
Only mod i would make on the E-99 is to get a new barrel. Boomstick or the All American 2002 would be my first choice. I got the AA and it works pretty good. nice and quiet, doesnt use up too much more Co2 than the stock and much more accurate.
Course the drawback, as Tom tom pointed out, is that you will want a better gun some day. and theres not much mods you can do to the E-99 to put it up to the level of say the autocockers, angels and what not.