I have that identical mower I use on my JD 4300. It's been a great mower. The blades are in need of sharpening, but I've been using it for 1 1/2 years. Hit too many rocks and sticks in that time. I guess this weekend will be a tuneup for the mower. I'll do the blades and get it all greased up again.
I'll use my mower for ballast occasionally as it is my second heaviest implement, several hundred pounds behind my backhoe.
Every week, I mow approximately 3.5 acres of grass with the mower. For about 2 acres of that land, mowing time went from 6.5 hours on a jd 212 to about 1 3/4 hours with my Frontier RFM.
The quality of the mower seems to be top-notch. I believe it's manufacturered by Woods. Woods has long been considered a very good product. It lost some paint in the time I've had it though. There is a small spot on the top of the deck cover where the paint flecked off, in addition to the reinforced lip around the base of the deck has lost its paint. The lip obviously is from wear and tear. Eventually the paint will wear off after running over grass, weeds, rocks, sticks and dirt. The rear discharge does a great job of distributing the clipping evenly.
At this point, I wouldn't hesitate to buy another mower just like this if I were to do it again. Hope this helps.