I have owned the Betsco 42" and 48" "medium" duty flail mowers. I used the 42" on the BX and the 48" on B2601, and LX.
If you are using them for around the house, they will do a good job. They are 100% Chinesium. I would rate the build quality as "poor to acceptable", but they function quite well. Both of the ones I owned left a really nice cut. I loved that I could bring them through the woods for brush maintenance, and that they did a wonderful job on thick overgrown grass, even with hammer blades. Leaving nearly a finish cut. Way better than the rotary cutter.
When I use my brush hog, I often hit a lot of immovable objects, I just don't get the feeling that mashing the betsco into something would go well. Whereas, the brush hog just shrugs it off. Keep extra belts on hand. I think for their price point, they are valued well, and do a great job cutting. But if I'm going off my property to my family or friends, I bring the rotary.
these flail mowers are
NOT quick hitch compatible, without doing some work.