I have the later version, the 52BB, it's one of the sharpest manual primes I own. A keeper. I also use it for normal shooting besides macros.I never used this macro lens for macros... But I bought it used and for my a6000 and took some nice concert portrait pictures with it.
Updating to the a6500 with IBIS made the lens a lot easier to use. Even focus magnify became easy. It is, otherwise, quite difficult to focus for my purpose (subject around 15 feet away) with very small focus-ring movements making all the difference.
Eventually, I succumbed to the temptation of autofocus and the lighter-weight FE85/1.8. I get a lot more successes --- but there was nothing at all wrong with those from the Tamron: it took lovely photos. And, of course, at low cost, it took photos that I could not have got at all, for the couple of years until I could afford the Sony lens.
As a recent returnee to "real-camera" photography, it was also good discipline for me to handle the manual lens. I'd now like to get the 2* teleconverter for it, and embark on another level of hand-held-manual-lens difficulty. It is not expensive, but not so easy to find in my country
I live in India. Another company bought up ebay's Indian territory, and ditched it, so I cannot buy from ebay.com for delivery here. I've seen them on ebay's UK site too: unfortunately, I forgot about this on a recent quick visit.... You should try to search listings in the USA.