I have one of these unit and love it. It weighs in at less then a 15lt steel. The unit is about 15kg. The bail out is what ever you decide to use. I use a pony for shallow stuff and a 7l ali for deeper dive. I know people that use a 5l on all dives.
If you are intrested in them get in contact with Blue Lagoon
Blue Lagoon Diving & Leisure - A Great Place To Dive, Learn |To Dive or Just To Relax & Enjoy
The run try dives on the unit for £25. They also do a Padi SD for submatix also.
If by any chance you at capenwray this Sunday you are more then welcome to look at mine. Any other question fell free to ask or send a PM