As a guy who is into home theater, av123 has a tremendous rep for coming up with gear that raises the bar in hifi gear. While they have some expensive items, they still are at the top of the value for money in their respective categories. Their speakers compare favourably with traditional brands costing 2x-3x as much, and now they are targetting electronics in a big way with amps, preamps, etc. Mark Schifter, the president, was previously the founder of Audio Alchemy who's standalone DAC offered the performance of high end DAC's 5x the price back in the day when CD players were the primary digital source. Their MFW-15 $599 sub is competing in sound quality against subs that cost upwards of $3000
I have no av123.com products, but I can vouch they really changing the landscape of hifi, home theater with their product offerings. If anybody can offer a class A headphone amp for $200, they can do it.