Re: Remo Ambassador coating wearing off...
Not sure if this is important but I've been playing with my Remo Vintage A for over two years on my main snare and no coating has worn. Only a few dark spots in the center.
I have a slightly used Coated Ambassador (modern) that I bought for $3 from a shop and it looks a bit like yours on the left. Not quite as bad (or I wouldn't have bought it) but you can see just very slightly that the coating is getting thin. I haven't used it but I would judge from the marks that it has only been used for one gig. I will try it on my snare soon to see what it does. I will still be a Vintage A user on this snare until something changes.
1) Pearl Masters BRX Vintage Sunburst
2) PDP FS Cherry Fade
Sabian AA, Meinl Byzance, Zildjian K