i went with the emark, got it yesterday, was $1800. out the door, was able to put it to the test today, we did 14 yards with it and i'm really happy. my walker is down for some maintance so i used the 30 only today and it did a great job- started bagging a couple yards and it left a real nice clean cut, then decided to go at the rest mulching and it did a great job, smaller clippings than mulching with the 21 proline, real nice cut. my helper cuts all small backyards with the 21- we were saving alot of time with the 30 on every yard. don't think the 21 is gonna see much action anymore.