Hey there.
I just got back from Bansko today after a week snowboarding.
Conditions are ok. only 4 runs currently open. the last couple of days the temp has really dropped and it snowed considerably. Also the snow machines are in use now.
Your best bet is to check www.banskoski.com for info on which runs are open etc. If your a begginer. Bankso is fine at the moment.
If not then you may get bored. But as no other resorts are open yet its your best bet of getting some skiing in.