The TRK 502 is pretty popular. It got good reviews and the 2nd generation has improved greatly.

I man cb500x is good but rider who loves bigger bikes choose the 502 instead of the CB.

But sadly the TRK251 not that popular. And don't have much exposure in malaysia markets.

Truthfully I never seen 251 in the road. Not once
But the 502 i seen it regularly. I mean like almost every weekend can see a few