very good, the desal membrane is the best available for under 600quid and the stainless steel housings are well, very very nice. Don't know why suppliers continue to use those stupid looking champ housings, we have a merlin and a stainless steel 4040 (2 different fill sites) and the 4040 looks stunning (i know it shouldn't matter but it kinda does).
plus it won't crack in the winter.