I went from A90D to Benchmark HPA4 and all I can say is that I would never purchase any Topping device, ever. The HPA4 screen is dimmable and it also has a Sleep option. If you have the funds to get the HPA4, go for it. You won't regret it.Hmmmmm, I might look to replace my A90D at some point if we don't have any statement from @JohnYang1997 on the status of the modules in this device. I'm a bit nervous after my LA90D double failure :\. I'm not sure there's other good options out there that allow balanced input/output, work as preamp, have remote control, and have dimmable front. The Benchmark maybe? I will look at it - hopefully its screen auto dims (anybody know?)