I ordered the quiet SR6 as an upgrade/spare for my own home-built SR6 and I’m delighted with it.
Delivery took only 10 days from first order, from mainland China to UK and I was lucky to not get hit for taxes, which I had already expected to factor in to the price, so it’s a real bargain in my opinion, which was what had attracted me in the first place. Having already familiarised myself with maintenance/repair on my own one I was less daunted than I originally was a couple of years back by the idea of ordering from so far away.
When the package arrived it was quite beaten up and I was slightly worried as there wasn’t a huge amount of internal padding but the contents are in pristine condition and I couldn’t be happier.
The build quality is far higher than my own home-built version, but mine was my first ever 3d-printer project (and my last so far 
) and has been amazing and I’m still proud of it (though I’m not showing all my friends and family )
I had already used brushless servos making mine but this was still quieter. At first I was incredibly impressed with how quiet it was, meaning I didn’t hear a thing through my ear defender/wired in-ear phones setup, but then I remembered I hadn’t connected the t-wist and this made it considerably louder but still somewhat quieter than my own. I might put some engine grease on the t-wist ring.
Another issue that my home-made one was slamming hard in a full down stroke, so I had got used to mostly limiting it and not enjoying cowgirl scenes that much, but this has changed that immediately.
I must note that I already had a vesa mount and a PSU for my existing setup so these did not figure into the cost, but they wouldn’t significantly impact the excellent value.
I have yet to try out the t-valve but I have transferred across my home-made heated case and my i-lube setup, which now seem pretty much indispensable to me. It would have been nice to have the t-valve built with the i-lube compatible design (ie to have room for a little rubber tube to come through from outside) but my own t-valve which I made died quite quickly so I never really got that used to it anyway. Maybe I will drill a very tight hole near the top of my case to put the tube through (I’ve just been using a standard fleshlight cap with a hole punched in it since abandoning my own t-valve).
I’m also looking forward to giving the onahole holder attachment a go at some point.
So yeah, just wanted to say thanks so much to @renwoxing and to express my delight at this purchase.