I was a hard-core fan of that mouse until my fellow gamers had me try out a Razr, never been back. Love the Lachesis, (have it on an Alienware laptop gamer) smoothest mouse I have ever used.
It is a lot harder to click...but the above says it all - waaaay slow and that is after I have put it on the top speed of everything. I have to keep picking it up to scroll back and forth across the screen...
I found the default mouse speed to be unbearably slow but after making the changes below I find my mighty mouse to be great. I have a 24" iMac with a 19" secondary monitor and I can scroll from one edge to the other with just a flex of my wrist. In fact I only have about 3 inches of space either side of my mouse before it hits either the keyboard or my desk upright. The scroll wheel does stick sometimes but easily fixed and doesn't happen too often if you keep a clean desk.
I also find right click to be easy and the scroll wheel is really useful.
I've been hearing good things about Microsoft's new mice, and they complement macs with their new colour scheme Either that or the Logitech G5 is a pretty sound choice