Absolutely, a crap shoot it can be. Several of your other picks are very high on my list, but basket is too full, and pockets are too light right now...very high on ZLCS. BPAX and AEZS are definite favorites also.
divot - I also like AEZS BPAX and ZLCS. I was in fact salivating over seeing some ZLCS shares trade at sub one dollar and wished like hell I had some powder because I would have gotten back in that one for sure down there.
It's always a good idea to cast a broad net in this sector and build a basket carefully.