I use them all the time, almost every time I apply a LSP (I do still use my Meg's bonnets on the PC sometimes, just because I have them).
I've tried the regular plush (Cobra brand IIRC) MF bonnets but a) they're sized to be used over wool pads, which quickly flatten out and provide so-so cushioning and b) aren't quite softe enough for some fragile paints.
I'm currently using suede-style MF bonnets to remove LSPs and they work well. They also fit over foam pads (I use them over Cyclo cutting pads) which provide good cushioning.
I like this so well that I keep one Cyclo set up to apply and the second Cyclo set up to remove.
Thinking of expanding your offerings?