I have been running the .23 for a little while now, actually one of the 1st. I run it with a p4 and an 0801 pipe. It feels like my modded js 21's but with more torque. I am waiting on my snake t so I finished last year with it and just ran motorama with it in my mugen 5t and it throws that thing around with authority.
It's not undriveable like most 28's but its really nice in truggy! You will not be disappointed. If you can spring for the extra cash I think he was offering a ceramic'd slugged crank version