So I'll give my thoughts after two brews now in various stages of bottle conditioning.
Overall, everything seems extremely well-made. It looks and feels great, durable, all around professionally crafted. Clearly a lot of time and effort went into this.
The exception, however, is the one page 'Getting Started Guide'. One faded, black-and-white piece of paper that doesn't look printed out, it looks like a fax of a fax of a fax. Almost impossible to figure what what half of the objects in the 'Contents' picture were supposed to be. Equipment costing hundreds of dollars deserves at least a color printout.
The jacket is a bit bulky and takes up a bit more room than expected when not in use, although that could well be simply because I don't want to scrunch it all up.
That brewers should not use Star San should really be bold red font somewhere, not tucked as the third or fourth item in the Warnings section, particularly given how widely used Star San is.
Usage itself was dead easy. I found it easy to move the carboy in and out of the bucket. Getting the rod out of the carboy was a #)%#U different story (and I posted about it). I recommend leaving just enough of the rod exposed up top to ensure you can get a good grip with one hand. I had to apply just a tad of water around the carboy lip and do a lot of wriggling, while using lots of uncivilized language, before getting it out.
The rod itself was a breeze to clean.
I have the Pro version. Seemed to work absolutely brilliantly, kept my carboy at a constant 19 degrees plus/minus 0.2 degrees.
If there is a drawback - yeah, this thing is LOUD. Like, bordering on unpleasant loud. We're talking considerably louder than, say, the PS4 cooling fan. I literally laugh out loud looking at the homepage pictures showing the Brewjacket being used in a living room - not an effin' chance in the world this thing is remotely usable in normal living quarters, unless you're living alone and gone all day, or you have a significant other but you long to live alone.
As for my beers itself, I'm not in 'drinking' stage yet with the first two brews done with the Brewjacket, but so far the beers appear to have come out excellent.
Overall I'm very happy with the product - yes, there was a (length) delay in receiving it, and yes, I think it's louder than I expected. And yes, the instructions included could be done to a higher quality.
But basically this is exactly what I wanted - easy-to-use, small-footprint temperature control. I'm going to be brewing up a storm and am really looking forward to my first actual lager!