I'm using the 537 for some time now and find it quite good. The Honda deck takes a lot of abuse, rubbing off walls etc. The mulcher works well if the grass is dry and regularly cut. However it tends to clog a lot if it's wet or very mossy. This is the case with any mulcher mower though as far as I know. It's absolute bliss though never having to use or empty a grass box (which we only use now for picking up leaves in the autumn).
So, in summary....no regrets.
Regards
Fran
ps no association with Honda etc etc.