Got the Logitech RX1500 a little while ago today.
Like the feel of the not smooth surface and color scheme, don't care for the finger-placement ridges. Left/Right buttons/switches are fine, middle button feel is also fine but placement not so good unless you use very rarely. Could have been in front of the scroll wheel and I would actually like it.
Scroll wheel. In click to click mode, I REALLY like it. Smoother, easier, than my Rollermouse scroll wheel. Also, you can send the wheel flying with maybe 20 clicks before it stops. In freewheel mode, it's as advertised. It'll roll for more than you need, that's not an issue. There is no resistance, very similar to the cursor rollerbar on my Rollermouse when rolling up/down. (There is very slight resistance in the side to side movement on the rollerbar). The freewheel mode is dead silent! I like the shape of the scroll wheel, you know exactly where you are on the wheel so horizontal scrolling can be done more easily.
I have one item I'm not digging too much so far. Changing the scrolling modes. Pressing down on the wheel is not a problem as far as functionality is concerned, it's HOW the wheel presses. It's a MAJOR mechanical press (not an electrical contact switch), sloppy, seems like you are activating 2 different mechanisms via the one click. It is NOT like clicking a middle button, which is what I thought it would be similar to. It is very inconsistent with the rest of the mouse operation.
One other issue is that the Logitech software on my computer is not seeing the mouse. I'll address that later.
Remember, I intend to remove the scroll wheel and put it into my Contour Project and maybe my Rollermouse. The wheel function is EVERYTHING. I don't think I want a separate button to switch scroll modes. I should have gone to a retail store to check out, but they are so hit-and-miss with broken mice, etc.
One fun thing is scrolling with the effortless and silent Hyperwheel, and moving the cursor with the equally effortless and silent Rollermouse.
EDIT--Now I would like to see how the other Hyperscroll wheels feel and operate. I definitely think this is a next step improvement in the "scroll wheel" department. It's pretty nice overall.