case 621b

My mulch guy is selling his 621b with about 12k hrs. 2nd owner. Anything to watch out for? Said he put new turbo on last year.

Is it possible to put a quick coupler on this machine? All my sectional snow pushers are on quick couplers and do much better that way. If it's possible, any idea on cost?

Guy says he'd let it go for less than 20k. Decent deal it seems?