Took my loft boom out on the water today. More than happy with it's performance.
Don't be put of by the $139 price tag - they really are a steal. I think the reason for them being so cheap is that the guy at windsurfingsales.com is selling them at or near cost as a bit of a promotion for his web-site.
I bought a 65% mast from him as well, heaps cheaper than many stores. Seems a nice bloke, and everything was packaged really well. Plus it's a real alternative for southern Sydney-siders who do not want waste a whole day travelling north to buy a spare part. (Just wish he sold harness lines).

Regards,
Harrow. (non-affiliated with windsurfingsales.com)