Having "attempted" to own two of these, I have a comment or two about them...
.
I wanted a small 60% keyboard so I was just going to grab a cheap RK 61, when I noticed the Anne Pro 2. I started checking them out and for the price they seemed like a "pretty good bang for the buck" mechanical keyboard, so I ordered one up.
The first one I ordered, the charging cable was bad, so I had to replace it. After finally getting it to take a charge I noticed there was kind of a high pitched noise in the room that wasn't there before. I have tinnitus(ringing in the ears) that can be set off by some electrical equipment. I couldn't believe there was any electrical components on a keyboard that could emit a high pitched whine noise, but it did have bluetooth so I took a closer look and also started to do some research. Turns out this is a well known problem with these keyboards AND there was actually a firmware fix available to get rid of the high pitched noise, albeit it in Chinese. After playing around with it for awhile, I finally got the firmware installed and I have to admit...it did change the pitch of the noise, but it was still evident so I got myself a replacement. Only to be hit with one that was worse than the first. I ended up sending that one packing as well.
By this time(I was getting a little fed up) I had also been researching wired 87 key TKL's as a possible solution...and at the end of the day I nabbed an ikbc 87 key with silent red Cherry MX switches and never looked back.
Still like the Anne Pro 2 though, for the price it's a solid choice for a 60% mechanical keyboard. Although, I still can't believe these(or any keyboard) could have a high pitched noise coming out of them. I guess if you're not susceptible to those things, or if you get one that doesn't have that problem...you're good to go.
Best,
Liquid Cool