Have had a buccas cooler for 5 years now, and wouldn't be without it.
Fits B really well, doesn't rub her even when clipped out, shavings don't stick to it, and it's a highly effective cooler - to the point that I've found her with condensation on the outisde of the rug, toasty warm and dry next to her skin.
I agree in that they may not be very popular, I had difficulty sourcing a replacement, and had to wait for next shipment for my order to be filled; I had only found a handful of places in my area that carried any buccas stock. Haven't tried their turnouts as I'd bought those before I bought the cooler, when my current lot need replacing then I 'll look at buccas.
edit to add she's a connemara, 14.2 and typical build for the breed, wears a 6'