I rode a local series a few years back, and found it just as Retro83 describes there ^ (with the occasional, very small hop-up here and there).
Can’t say they’d all be the same, but there was loads of support from the organisers and they were all, without exception, good natured, friendly events.
Plenty of people were frankly as rubbish as I was which kept it fun – and people encouraged each other, or took the p as appropriate. Some of the riders were scarily good too – I honestly don’t know how some of that stuff was ridden.
I’ve still got my Onza, it doesn’t get out much, but I do mess about on it sometimes if I want an [unconventionally] difficult time on a bike.
Give it a go, what’s the worst thing that can happen?
😉