I've been finish mowing with a Woods RM660 72" rear finish mower for about 12 years, about 3 - 4 acres all together. I pull it with a JD 820, about 30 hp at the pto. The Woods provides an excellent cut, as long as I keep the blades sharp and the underside of the deck clear of buildup. /forums/images/graemlins/cool.gif
Problem is, the 3 acres is broken into about 4 different plots of irregular shape, which means lots of clutching and shifting and running over grass that is already mowed. So, it takes me about 2 1/2 to 3 hours to mow all 3 - 4 acres, which seems like a lot of time for a 72" cut mower. /forums/images/graemlins/frown.gif
One of the pleasant surprises I've found with my new
bx1500 is that because of the mmm setup and hydrostatic transmission, as well as the tight turning radius, I can mow these 3 acres in about the same time even though the 48" mmm is 1/3 less cutting width. And without all the clutching and shifting and wasted travel. The power steering is nice too. /forums/images/graemlins/grin.gif Makes me wonder if I still need the Woods. Plus, I can get at the other areas with the trees and shrubs that I used to mow with my Cub Cadet that are too tight for the Woods.
To answer your question, I think that if the three acres you're going to mow is a rather open regular shaped space, the L series with the rfm will do just fine. If it's chopped up into smaller pieces like mine, you'll still get the job done, but it will probably take longer than it would with a mmm. /forums/images/graemlins/smile.gif