Had mine a while and done quite a few hundred miles on it now, would say it is no more comfortable than the original, and I still get a numb bum after 90 minutes in the saddle, this has a lot to do with me suffering a bad back though.
As for handling for me it has really helped with me getting my feet on the ground (29" inseam) which is good for confidence.
The seat well and truly looks the business and even if I get a custom made with my original as the donor (may do one day) I will probably keep the low seat in case I should ever sell the bike (dont panic, would only buy another)
If you wish to try it out and your ever heading upto wales give me a shout and I can surely arrange it!