I did before the 51st St location closed, learned a lot and got some great parts to boot. The treasure city location is packed, get there early.
I highly recommend checking it out. It could really use some money donations to help get the new facility up and running if you can spare a little for a great cause. You can sign up to donate services and goods to help the new location too. These are needed much more than any bike centric volunteering at the moment.