Well we did complete the one day Harbor View, Victoria Peak, Aberdeen and Standing Market tour. My wife was not feeling the best, but we made it through most of the tour except for the last part of the Standing Market.
It was a beautiful day and the Harbor views were amazing. Our tour guide Terry on the land portion was really good. She was very pleasant, lots of good information and was very funny.
It was a great day and I would recommend this tour. Yes we stopped at a nice Gem shop. We did not buy anything, but there were some nice pieces, but overall this was a small portion of the trip and as many have mentioned often to expect. Again it was not a bad point and many people bought some nice items.
We did not end up making the Lantau and Monestary tour the nixt half day since my wife was still not feeling the best, but we walked markets instead. So I can't comment on that tour, but again I would think it would have been nice.
For our two days it was very nice and the one day tour was well worth it IMHO.