I have two Maine coons just coming up to one year old and producing waste commensurate with their size. I have been in two minds about the litter robot since I got them. John Lewis is now stocking it and they have £100 off a home spend of over £100 that it qualifies for. Set it up on Friday night and they both started using it the same night. I am so thrilled with it. It was a lot of money (made less painful by having a lot of John Lewis vouchers so didn't feel like real money) but so far feels like it's going to be worth it!
Just thought I'd post in case the ability to deal with a U.K. retailer plus decent discount made up anyone else's mind!