Well worth going to mate.
Even if you're not in to old Brit crap (which I am) there's plenty of older Jap stuff.
Loads of stands selling anything from Tshirts to bikes.
Lots of tool stalls and usually a couple of stalls selling metal off cuts, which might interest you.
Usually a good few nuts and bolts sellers as well.
The main hall is massive with club stands and people selling all sorts of sh1t, some good some not. Upstairs balcony is mainly club stands. There's a couple of very expensive bars as well along with a very expensive crap cafe. Take your own beer an butties.
3 smaller halls are off this again selling almost anything bike related.
Usually a couple of guys there who make exhausts.
LPM are usually there. They make very good quality replica body parts, including for Kats and usually give a good show discount.
Outside is a massive open air market. Usually a guy near the bottom of the field who sells used Suzuki bits just laid on the grass.
Don't get me wrong, there's a load of over priced junk there too.
There's usually a posh bike auction as well. A mate and myself accidentally ended up wandering in to this through a side door a few years ago. We were very politely asked to leave "as we didn't look the auction type"

what ever that is. I must have looked particularly skint that day
If I wasn't working, I'd be going.