So my mate is on his second season of sailing on a starboard GO 150lt. Here's some observations I have in case they help:
They're bulletproof, so that really suits the beginner - you can absolutely hammer the boom into the decking and it will not even show. This may be to your advantage when buying from a wind-school. They're also surprisingly (relatively) light for all that padded decking.
It can be ridden hard if you're heavy and brazen enough. My 100kg mate hit 29kts on it the other week using a 6.7m in 20-ish knots - smashing downwind thru heavy chop! I kept waiting for the explosive 'highlight-reel' blowout but against the odds he held it down. Apparently has little self-regard for his own safety!
They can plane early if matched with a big fin...go for the high forties if you're going to sail 7+ metre sails in in light winds. If you're more in sub 75kg bracket you'll get away with less.
Super stable - you'll never have trouble up-hauling or tacking with it. It'll waterstart with enough wind (like any board)
They do turn like an shopping-trolley. But that's alright - you can still gybe it with a lunge across the width to the inside rail. Warm up your groin beforehand - it's one giant step...