The local shop here in Zürich is very nice and I had a chance to test the A2 with the W30i side by side for about an hour. Coincidentally, there was also a pair of A5 there, which I could use as the reference
Generally, the W30i is a little bit bigger than the A2, which could be a factor for some desktop users. They are both solid built, well made, stylish. Gold plated connections on both.
A2 Pros:
- better performance in higher volume
- better bass
- compacter
- Kelvar cone
- richer/fuller sound
A2 Cons:
- mids a little bit bungled/stiffled
- very directional (must point them directly go get good mids/highs)
W30i Pros:
- Remote control
- Wireless capability (need extra accessories)
- clear mids and highs
- nice stands included
W30i Cons:
- (very) weak bass
- not so good at higher volume
- slightly bigger (for me a con)
Conclusion:
I picked up the A2.
I say they are both worthy choices and good value for $$$, but A2 suits my taste better. And a quick adjustment on the equaliser on iTunes made the A2's mids&highs sound just as good as the W30i
I am sure that someone would have been just as happy with the W30i.