I've got a Hydraflex hydraulic system that is now leaking and I can't find a seal kit for it as their web site is very limited. The steering is very heavy at the helm. I have driven a rib with a sea star system and its like having power steering on your boat and you can get spares for them. Its a no brainer.
I might change mine for a Seastar next year.
Don't buy this model even if its cheap on ebay.