As a small aside, it's worth checking that the aircraft you're flying are actually cleared in the POH for the manoeuvres on the course - such as spinning with a lapbelt & shoulder strap rather than the required 4 point harness (C150s/152s apart, of course!). Can be a trifle exciting doing a steeply pitched down spin recovery in certain small T tail trainers without the correct harness. Otherwise it's well worth doing a basic aeros course - or even just ask a local school for some more taxing sessions on short field ops, grass landings, getting steep turns near perfect, etc. You'd be surprised how few of the basic skills are practised post-test. After all, how many self-hirers routinely give themselves a PFL or other mock emergency in the cruise, given today's hire rates??