I just bought a TG-6 & PT-059 last week. It started as a bit of an ordeal, but ended up very fine. I started buying the camera/housing from Amazon (yea, I know) due to being a LOT cheaper than other Canadian sites. I pre-bought but they said "released on Friday" (June 28). Well, on June 28 I got the email "delivery by Aug 15-Sep15". WHAT??? Maybe it will be sooner if they get stock, but still...
So started checking around. Long story short, my "go to" camera place (Vistek Calgary) had the camera showing "in stock" on July 4, so I phoned. The fellow actually went to the back room and brought out a black TG-6, red TG-6 and housing. I bought the red camera & housing then and had them shipped. It ended up only costing $23 more than Amazon (no, they won't match Amazon).
It came last week and I spent the week playing with it. It's really nice, but the manual is kinda junk. For example, the manual does not tell you the ONLY way to get 1cm focus in Aperature mode with close-up turned on is if you zoom to 1.2. Leave zoom at 1.0 and you only get 3" or so. (I verified this many times).
Also, I was a bit disappointed to see only 3 "actual" aperatures as has been mentioned before in this thread - f2, f2.8 and f8. It does change if you zoom, but I tend not to zoom underwater.
Thursday I put the housing in my 2ft long "submersion tube" with soft weights (empty housing) and let it sit for 6 hours. No leaks.
Today I put it all together, and went diving. Sadly, only 2ft visibiltiy and tons of snot in the water, but I was able to get some very fine photos anyway. I used Aperature mode, minimum shutter 1/125, max ISO 800 (so the flash will work more, but that's what flashes are for). I liked the photos and all had a nice dark background, which is what I want when doing macro shots.
I also was using only on-camera flash as I haven't decided what I want to do for external strobe yet (probably Inon S2000). I used a SOLA1200 on my left hand as dive light & video light, and it works really well.
Before I limited the max ISO to 800, I had it at over 6400 and the shots were extremely grainy, as expected.
I put the housing on a spare aluminum tray I have, with only left-hand ball grip. That lets me put my standard bungee lanyard & clip so I can stow the camera when I want. It was really easy to use underwater, and a lot of fun in spite of the horrid visibility.
-R