Nige.
Last time I sailed mine was about 12 years ago. Used to race, or should I say TRY, with others.
From what I remember my 575 went well, but as I still had my L plates on I was never up near
the front of the pack.
The more experienced sailors used better sail material and spent a lot of time making various
adjustments all to good effect.
The ballast is NOT supplied with the kit. I think I used lead shot in mine, sealed in with resin if I
remember correctly. I will have to get it out of storage and check. Maybe post a picture too.