They are as good as it gets. Knowledgeable, polite, responsive, accommodating - huge selection, competitive prices.
Upscale Audio is up front with customers
I have not bought from Upscale before but have enjoyed their videos. The approach Kevin Deal is taking with his customers is really up front and honest. A good model for how to communicate in audio, and in general.
https://www.youtube.com/watch?v=wV0oswlwx2M&ab_channel=UpscaleAudioHighFidelity