Free advice normally costs the one that takes it /forums/images/graemlins/grin.gif, but here's mine. I had a b7500, fel & bh with turf tires. I now have the b7800, fel & bh with R4s. I wouldn't throw rocks at the b7500, but there is a real difference in what the extra weight and power will do. I know the B7500 is a little smaller horse power than the B7610 but same frame. In my opinion, the 78 is well worth the difference, even if you have to streach the payments. I only had 54 hours on the 75 and about 12 on the 78. I would also suggest anyone getting a fel get a toothbar.