I've only had good purchase experiences and interactions with them. Recently purchased Western Electric 300B at a great price, one failed in early hours, they were very helpful and prompt in securing replacement.
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