GBSC's B4 and L33 are perfectly competent gliders that are
underutilized. The B4 is quite well instrumented too (SN10 thanks to
Dave Nadler). Over the years several members have taken advantage of
this and done long flights in them.

That gives you time to mull which glider to buy. Partnerships are a
great way to get a better glider and split expenses. Few people have
that much time to fly these days.

Juan