I've owned Topping's E30, L30, DX3 Pro+ (twice), and recently purchased a D70 Pro Sabre (that I'm in love with). They have all performed flawlessly for me and have been 100% reliable. My system has not been nor will ever be PC based, so I never have to worry most of the issues I see so many have with Topping products, and never have to worry about constant firmware updates. I use the optical input for TV, coax for my Sony UBP-X800M2, and AES input for my SMSL PL200T. I live by the K.I.S.S. rule and it makes my life far less stressful.
That said, as great as Topping products have performed for me thus far, and measure and sound given their low prices, I never feel like I have total piece of mind due to all the issues reported by others. I really need to stop keeping up with the DX5 II thread because it gives me cause for concern.
I too will only order Topping or SMSL products shipped by Amazon, so that I can easily return in the event of any issues popping up in the first 30 days, not to mention that I'm an impatient man and am not willing to wait to receive an item from China.
I feel bad for anyone who has to deal with CS issues from Topping and I have a crazy thought:
Topping should have a small facility in the US to deal with issues with their products quickly.
I nominate Intercourse, PA.