had a bad experience with woofersetc a few years ago. used them cos i wanted a lightning audio product not available in australia at the time.
but won't be doing that again in a hurry. took about 4 months to get the items after paying for them and heaps, and heaps of hassles with emails getting them to send it.
US prices can be cheap though. especially as most of the online 'stores' deal with 'parallel imports' or the 'grey market'. that is, direct imports from the factory, bypassing the official authorised distributors. as such, no warranty outside of the US and won't be backed here (fixable of course...at a price).