When I was into gaming for a little more than fun I went though every mouse that came out.. mouseman+<explorer1.0<boomslang<explorer2.0<duallogi<explorer3.0<mx700<mx1000
are the ones that lasted at least a month.. duallogi and explorer3 were very close.
ANyways mx1000 is quite a jump over the mx700, I was quite suprised.
MX1000 has 12 buttons..
1,2 left/right clicks - they work
3,4,5 thumb buttons, they are better placed than the mx700, all 3 are very useable. I can use them all with easy.. i never used the forward button the mx700 it was too much of a reach.
6,7 up/down buttons around the wheel, simialr to the scrollup/down on the 700, only differece is these are useful
the down is a little reach and i probalby won't use it but hte up is very useful.
8,9 wheel up/down, theres no click while the wheel turns compared to the 700 but it is very accurate, its not mushy like the explorer3.0 was. the click is gone but i'd say its just as good, just different
10 wheel click, little harder to press than the 700 but its not that bad, some people proablby will like it more
11,12 tilt left/right.. kinda hard to press, same press as the wheel click but your pushing to the left and its not as natual as down. most likely i won't use it
Overall I'd say on the mx1000, out of the 12 buttons, 8 are very useable.
-2 for the tilt left/right
-1 for the down button around the wheel
-1 for the wheel click (i've never used wheelclick)
On the 700 for comparison
1,2 left/right click.. work
3,4 thumb forwardback, little reach to the back but doable, the forward is too far a reach and i never used it
5 application button, what a joke worst placed buton ever
6,7 scrool up down buttons, too small, the down is impossible to use the up is a little reach.. i never used either
8,9 wheel up down, nice click i liked the wheel
10 wheel press hard to press but i never use them anyways
mx700 where I'd say out of 10, 5 are useable.
-1 application button is worthless on that mouse
-2 up/down around the wheel, too small and hard to reach
-1 forward thumb
-1 wheel click
"Is the tilting wheel useful, or is it a pain? I depend rather heavily on the middle button for object snapping in DataCAD, and if this tilting prevented the middle button from working (or if it cannot be disabled), then the MX1000 would be a non-starter; despite the apparently awesome tracking..."
The tilt can be ignored, i've never accidently tilted when i meant to do something else, you specificaly have to push the wheel to the left, its not like the explorer ones that mush around. (least i think that was an explorer i remeber it on) anyways the tilt doens't interfer wiht the normal wheel functions at all
Some other stuff about the mx1000... according to specs its heavier than the 700 however mine feels lighter, perhaps the weight is more evenly distribued but honestly if i had an accurate scale around I can't believe the 1000 is heavier.
The batteries last a very long time... i don't believe 20 days but over 10 is very realistic.. i guess it depends on usage, but either way its much better than the 700
The putting hte mouse in teh charger always charges! lol i hated trying to get my 700 to charge sometimes.. so far the 1000 always makes contact and begins charging.
Accuracy is insane... 700 is great but you can tell the 1000 is better when you use it... i cant think of a way to test the 2 however... soon as you use it you'll noctice how nice it is...
overall 1000 is a big jump over the 700, i didn't expect it to be much more than a 700 with a new design and I'm quite happy wiht what it turned out to be... actually i'm ordering one for my gf so yea if its good enough for her its good enough for anyone
My previous Logitech Click! Plus worked fine, so I don't know what's goin' on... They do work with IE. 
