I have Logitech MX1000 too, worked for a good half a year now and I love it!
When sometimes my mouse runs out of power, i got to take other corded logitech black mouse (the most simple optical mouse with wheel) and it's too LIGHT!! Yes seriously, IT's darn too light! So when my mouse is charged, i can enjoy the good of MX1000 again!
Before i got this MX1000, I never thought mouse can do SUCH A DIFFERENCE! Very ergonomic and buttons on it's top and sides are very useful, in games, in internet.