The Inbred is a very capable machine, although they had to change some of the tube profiles in ’10ish to comply with the CEN regulations, so in reality it became quite similar to the 456 anyway. The 456 complied with CEN already.
I have ridden a 456 with a 100mm fork for the last 5 years, and it’s wonderful! In retrospect, i should have probably bought the Inbred with sliding dropouts, but i’m more than happy with my 456.
There are other options out there, but most are made of fancy tubing and cost thrice the price. Internet hyperbole aside, i couldn’t justify the extra outlay. So in terms of value, i think the On Ones are hard to beat.