We did two snorkel trips with these folks. One a short trip to Kendwa reef. Quite inexpensive and the snorkeling was so-so. The second trip was to Mnemba island reef. Still reasonable at about $50/each. The thirty minute ride from Nungwi beach area was chop pounding thirty knot passage in a semi-rigid dive boat. That allows for longer water time than most competitors but is a bit wearing both ways. The reef was as good or better than any in the Caribbean, Hawaii or Mexico. Remarkable number and variety of fish and coral. Well done.