About 3 weeks ago i bought a dual optical from BB (BestBuy)...and i totally loved the mouse !
Especially how it felt in my hands.
About the same time i got my Dual Optical (which i ordered online) Logitech made this big announcement that they now have "better" mice (MX700,MX500,MX300) with a better sensor and stuff - so i got kinda mad and returned my Dual Optical to the next BB.
They didnt have the MX500, only the MX300 and MX700.
I would never buy a mouse like the MX700 (too expensive, heavy...etc...)....so i got the MX300.
In comparison to the Dual Optical the MX300 feels "simpler" (DOH! It has no thumb button) and somehow "less thrills" - but i have it now for about two weeks and i do like it. Although i wish they would have the new MX sensor with the Dual Optical Design.
The mx300 is a no-thrills, but very precise mouse. I have no probelms whatsoever with stuttering or lags....(dunno..never had, since the Dual Optical was my 1st optical mouse and now the MX..so i dont know "bad" optical mice
If i'd to compare Dual Optical and MX300 i'd say the Dual is more 'mature' (in feel)...while the MX300 feels more like a smaller but precise surgical instrument. I think it's a matter of personal preference. Both mice are definetly very good. (And yeah..the MX has definetly a harder/louder 'click')
I use the mice in Win XP..on the PS2 port (set to 200hz refresh rate, better than USB ...and i use mouseware only on Win98.