So I also I just came back from St John yesterday and I dived with Low Key and 6-paq. DJG has mentioned some good points, I too came up with roughly 1100-1200 on most dives sinve they limit your time underwater to about 45-50 mins max and most dives aren't deep. The only longer dive was the Night Dive around 50 mins max depth of 65ft (which was a pretty cool dive, but it was my first night dive so I enjoyed it even more I guess). Low Key took us to Congo Cay (night dive), Grass Cay and Stevens Cay, which are all in Pillsbury sound. Their boat is nice and their divemasters are nice. I also dove with 6-paq. Since I was the first to book that day I got to pick where to go so I asked for Eagle Shoal and they took us there. This was a longer 6 hour trip and we did two dives (Eagle Shoal and Booby Rock). Eagle Shaol is a cool dive with nice swimthroughs and underwater cavern formations, etc.. Also saw the most vaired types of fish on that side of the islands, (Queen Triggerfish, Black Durgon, Really really big puffer, big queen angelfish, flamingo tongues, brittle stars among all the other common caribbean fish. Spotted Lobsters on many sites, and saw the hugest lobster ive ever seen at Grass Cay. Also saw a big Channel Crab on the night dive along with a big tarpon feeding on fish and parrotfishs sleeping and birttle star moving away from my dive light, etc. I also snorkellled many sights around the islands, I thought there were plenty of fish in the snorkelling sites but the reefs were only in ok-decent condition in most snorkelling sites. Although the snorkelling around Waterlemon Cay was cool, I saw at-least 7-8 rays there including an eagle ray, a huge Green Turtle and my girflriend saw a Nurse Shark (which was the only shark the whole trip). Also swam with a hawksbill turtle late in the afternoon on the other side of Trunk Cay (not the trail side) on the sand. 6-paq's captain Larry was a very nice guy as was Brad the divemaster. The boat is smaller but there is enough space for 6 (they dont take more)to sit comfortably but not much shade, wasnt a problem for me since it was a partly cloudy day and the sun was always baking me and the wind keeps you cool when your on your way to the sites since the boat is more like a little speed-catamaran thats pretty fast. To get to the site we did a whole circle around the island which I enjoyed very muchg as it was like an island tour plus diving. They even let us snorkel at the end of the 2nd dive at Salt Pond Bay for a half hour too so all in all I enjoyed diving with 6-paq a lot. I also recommend Low Key if you want to do some quick dives in the morning around the Pillsbury sound area just know what to expect, With Low Key, We left around 8-8.30am and came back around 11am on the short trips so you have plenty of time for other things on the island which isnt a bad thing since there are many beaches on the island. If you want more freedom and dont mind paying a little extra then 6-paq is also recommended. I dont know about Down Under diving but from what DJG has written, they seem similar to 6-paq and she recommends them also so I guess its worth checking both ops out if you wanna have a more personal dive experience. Overall, I was happy with both Op's for what they are I think its good to get a few short quick trips in along with some longer trips to sites less travelled to. So now hopefully there is some more info on diving around St John, now that this thread has gotten some good replies and more current information. As for shore diving, I didnt see anyone doing it but I did see some people load dive gear on to kayaks on Hakswnest beach to head out diving closeby. Also, lastly I forgot to mention, 6-paq does not have an actual base either, they pick you up with their boat from the Dock area in Cruz Bay too.