Underwood Hifi / Underwood Wally...

I sometimes receive e-mail blasts from this seller/retailer.  This online retailer seem to handle many brands of various audio components, some with some name recognition, some with none.  All products are advertised with screaming discounts and cable giveaways (is this a red flag?). 

Some of the brands like GAS and LSA, seem to go back quite some years.  I am trying to understand how this business works and whether it is reputable for selling solid gear.  Or is this like some retailers that buy up old defunct trademarks then sources gear from cheap contract suppliers that make stuff at low cost, cutting corners with quality?

Would appreciate any insight or customer experiences.  There are a number of items that could be of interest to me as I upgrade my two channel system but I can't help but be somewhat wary.