Since there are a lot of questions about the 10% THD (which did alarm me too at first glance), I'll share what I know and think since I was interested in this amp because it was only a couple bucks more than the SMSL SA-36A Pro (or even cheaper depending where you buy from).
The 10% THD is at the amp's rated max load, and will be much lower at lower loads. From my reading around and research, I've learned that these TDA chips are usually rated at around 1% THD at >78% loads, which would be 2 x >125 watts @ 4 ohms.
My thoughts? These are perfect for driving 120 watt @ 4 ohm or lower speakers at very low THD, especially at this price. SMSL is usually good quality and have a pretty decent reputation within the online community, so I don't see there being a better amp at this price, especially since at a couple bucks lower the next best thing is the SMSL SA-36A Pro (0.01% THD at 2 x 25 watts @ 4 ohms).
The TDA7492PE chip SMSL SA-36A Pro uses is rated at 10% THD at 2 x 57 watts @ 4 ohms. My basic math here tells me that the SA-36A Pro will not get even close to similar levels of THD as the SA-98E at the same load levels. If the TDA7492PE is >0.01% THD at 2 x 25 watts @ 4 ohms (this is roughly 44% of the TDA7492PE max wattage), maybe this amp's TDA7498E will have a >0.01% THD at around 2 x 70 watts @ 4 ohms.
This is just my opinion so feel free to take it with a grain of salt, but I think there's pretty concrete evidence that you won't find any amp near as good at this price range, at least with SMSL level or better build quality. I've already canceled my SA-36A Pro amp order which I found on sale for roughly 40 bucks, because for 25 bucks more this seems like a way better deal, especially since my monitor audio radius 45 speakers only need 25-50 watts @ 8 ohms per channel.