I bought one new in April of 2002. I've used it for 2 solid years, I have the 32" with 15 HP Kawi. It has performed flawlessly for me. If you do a search for Metro, you'll find other threads on the same topic.
I picked the 32" cause I do lots of small yards that have gates and it fits into the back yards with no problem. 36"s might not fit depending upon the property you are doing.. And using a 21 is just silly if you can use a 32..
I use the mulch kit on the Metro and it works out very very well also. I have to double cut if the lawn gets too long in the spring, but overall, it's terrific.
I just got this Metro HP. I got it because i need to get a couple of pounds off. I have just got the Accelerator bagger for it. there are alot of cool stuff for exmark mowers just keep asking and you will see.
I have two exmark 36 & 48 walkbehinds with velkes on both. Purchased them both brand new last year. I absolutely love them. They cut and stripe beautifully. I did use the mulching kit, but probably won't this year.
we got one last year for the fenced in areas, tired of having to buy a push mower every season, and work so hard for it. We got the belt drive, since we only use it 5 hours at the most each week. If it was needed full-time I would definetly get a hydro.