We stayed at Tanzanite for 4 nights in January 2011; the hotel is very nicely situated with a pretty garden down to the water and pleasant bungalow accommodation. The power supply is a bit erratic and the water pressure pretty poor so don't expect a cool room or great shower but you make allowances when visiting far flung places! Our two points of major concern are the following: firstly the lagoon is very unsuitable for bathing as it is full of sea urchins - I would not recommend visiting without neoprene boots or sturdy reef shoes. To reach the reef when the tide is out is a long walk! Secondly, the food here is pretty awful. There are few options available other than the hotel restaurant at night and the menu very quickly becomes tiresome - after only two nights we were dreading a visit to the restaurant. The service is very slow and the choice pretty limited. I must say though that the staff during our stay were on the whole lovely, and especially caring, as my other half had gone down with a nasty case of food poisoning in Stone Town prior to our stay and they provided a very soothing sweet spicy tea which made her feel much better. Think carefully before booking here.

I still hear the words of the chef in my ear: "sorry, we don't have the fish you ordered anymore but I will bring you another one.." -some hours later, I had food poison and won't go into details, but it was really awful. At the same time, like many times before, the toilet did not flush - again no details..
electricity is also somewhat unreliable, but I guess thats part of the deal
Besides that, you can't swim during low tide (sea is far off the coast), nor during hide tide (too big waves).
Yes, you could use the pool - but although the waterdepth is only about 2m, you can't see to the bottom which tells something about the water quality.
Internet terribly slow as the service. I don't want to say all is bad, its just that you can get so much more for the same price only a few miles to the west, where the beach is at all times swimable, service, food etc are better. Try to organize trips and taxi rides locally - for about half the price..

James and his team were really wonderful. They made the impossible possible. The chef at the resort offered great value for money food, with healthy sized portions. Service was great. Accommodation was clean. Overall a really pleasant place.

Getting to the resort was an eyesore with the litter and rubbish from nearby informal settlements strewn about. Perhaps all the resorts in the area should pool resources to improve on the collection and recycling of waste.

Helpful and friendly staff, clean and comfortable bungalows with plenty of sun beds in spacious well kept gardens, but the hotel/complex is a bit isolated being approx. 25 minutes walk down the beach (tide permitting) to the only two small general food stores in the small village. The food at the Tanzanite was reasonably priced with a small varied choice every day and was quite good. Nothing to do at night except to chat to other guests.