Hi Guys. My name is Ben Mazin, and I am the designer of Jetboots.
Interesting comments. Here is my general reply.
1) Jetboots are very expensive. I wish I could make them cheaper - I'd certainly sell a lot more. The problem is that in order for them to be more than a childrens toy they need to be extremely high tech - DC brusless motors and controllers, NiMH batteries, etc. and two of everything! The fact is that if they had the same mark up as a Gavin scooter they'd cost more like $15000 dollars. As it stands, the gavin is $3500 and Jetboots are $5000 (soft pack, $5250 hard pack). They are designed for different types of dives, but for certain dive profiles they are invaluable.
2) Tech list. Yes, Jetboots were mentioned on the aquanaut tech list. The opinion of them was actually rather positive (as you will know if you spend any time on that list they can be rather... critical). Jetboots aren't really designed for 18000' cave penetrations, but they are superb for some dives. For example, external photography of a deep wreck in a current. The hands free use is where they really shine (and fun dives - Jetboots are very, very fun).
3) Ascents. Don't use them for asents. Use your BC.
4) Parapalegic divers. Good call, TexasMike - we have had significant early interest from the handicapped diver community. Not just parapalegics, but people with knee and hip problems that make kicking painful or impossible. Also some interest from the military.
If you guys have any questions about Jetboots feel free to post questions here or email me at ben@jetboots.com. If you are interested in a Jetboots demo, we are located in Southern California and are happy to show them off. Check out the FAQ on the website for details.
Ben Mazin
President, MST
http://www.jetboots.com/