Thanks for your replies.
Tab, that's so sweet that Amber brings you the pill pusher. I've crushed tablets in the past and mixed them in with food to get them down mine as we've never got the knack of avoiding scratched faces and ripped t-shirts! Luckily the cystease mixes in well with her food!
Cystease is certainly cheaper and I'm quite happy with that! I just wondered if Cystaid was a better quality as the price tag is higher.