You cannot replace the earphones, but the existing ones (that when left dangling looks like sidelocks) are good. The bass is quite effective and there's not a lot of treble response. Just the way I like it.
It comes with precious few buttons, because you have to use them while the glasses are on. Each button has a dual function, and these are easy to remember. The pair we got comes in 512MB, although you can also get these glasses in 1GB capacity as well.
I tried these glasses on ten different people, and only one managed to carry them off with aplomb. The rest, including me, looked like nincompoops. That's the problem with such accessories; you can choose them only if they suit you. For biking purposes, I think they will work just fine though.
The aigo iSonic MP3 sunglasses cost Rs 6,000. This is quite steep, considering they are rather uncomfortable and can give you a headache in a few minutes. If you are an outdoorsy kind of a guy it makes some sense, otherwise imagine sitting at your desk in office wearing these!
Moreover, consider this: if the earphone breaks or retires, you'll have to throw the whole kit away. And much as I hate to say this, you'll have to resign yourself to using them as regular sunglasses.
I have used the 1gig pair of these for over a year almost daily and never ever had a headache.
