I have a 5' King Kutter on my B2510. Haven't cut anything 2" I don't think, but certainly 1"- 1.5" range. No issues yet. Lots of threads on the "quality" of KK, but they are relatively cheap and I've had no issues with mine. I do need to lower the pins so I can raise the cutter a little higher off the ground for transport.
I won't comment on price, because I'd be quoting Canadian dollars and local market that is irrelevent in most cases. The folks here will want to know where you live to help you out with accurate $$.
Kevin