antod- Unfortunately, any modifications that you do to your kit before your warranty expires will technically void the warranty. That is to say any part that you install that isn't a direct OEM replacement part. Since Allesis does'nt make mesh heads, installing mesh heads will void your warranty. That being said, I have heard of people that save everything that came off of the drum and switched it back to OEM configuration when they had a problem. There isn't too much that can go wrong with these pads, but if you are concerned about voiding your warranty, I would PERSONALLY suggest that you wait to do your conversion, until after which time your warranty expires. This is just my two cents.
I didnt own my kit for 2 weeks when i did my conversion. In my case, the benifit of having the Mesh Heads far outweighed the consequence of voiding my warranty. Also, I feel comfortable that I can repair my pads myself if something were to happen to them. Again, Just my opinion and reccomendation. Rock On!!