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CPICKUP15
Not cheapest ever but pretty good deal if you need one now.
Selling at MSY for $25 but it's been as low as $15 in March, or $12 last year
M525 seems great but they are almost twice the price.
2x the battery life but also needs 2AA battery instead of 1.
For everyday use i'd still go with the M325 :)
For portability the M325 is more compact. The M525 is perhaps better ergonomically, but if it was occasional use you could pick either way. Functionally they are similar, with comparable performance on surfaces, similar mouse wheel and the nano unifying receiver. I prefer the M525 for daily use, but keep a M325 with the laptop if traveling.
If you had to pick one mouse, would you choose the m325 or the M525?