This might be late to the party but I'd like to share my experience as it maybe useful to others.
I used Bugare PS-1 as my first tube amp volume-taming device, which, after first couple of hours of initial use I sold it right away as this thing sucked my amp tone drastically - loss of highs, loss of definition, loss of joy. Simply put, it's like you cover your amp cabinet with a thick blanket. Worst attenuator ever. But I didn't expected much from it knowing it's a cheap resistive type of attenuator from the start.
After selling the PS-1 I made my DIY volume box using hi-end parts inside. This device must be placed in effects loop of the amp. The tone quality is obviously far better than the previous device - I would rate it 8 out of 10 transparency wise - very natural and for most users. I think this method is good enough without breaking the bank too. Unfortunately this method isn't for you since your HXDA doesn't have the loop. However I've found the weak point of using this kind of device; the output of all other pedals dropped a lot - the more I dimmed the volume box, the more it affected the signal level of my delay, reverb, mod, etc. So I decided to try the next one.
My lastest attempt is this Weber Mass 200 with custom built-in Phones out. It's very, very transparent. The Treble Compensation knob is very useful for me as it helps bring up some highs when I turn the amp volume down too far. But surprisingly I can never turn the attenuation knob beyond 1 to tame my Archon which is working in 25W mode. The amp would still too loud beyond that point. I don't know why, but it'd be much better if I had up to 3-4 comfortable area on its attenuation scale. Another thing to note is that the craftmanship isn't spoton; the attenuation pot has incredible amount of play/free-turn (sorry for my English). But apart from those minor blamishes - it's a great attenuator for its price and I'd give the Weber 9 out of 10 tone wise. Oh I must add that it's a reactive load type too.