Can not say much, I just bought one [250]. Have not dived with it yet. Some peopel I bumped into swear by them. Mostly used by European divers although I have seen some Americans using them.
Look solid, well built [alu body], the battery pack as well as the flash tube with the reflector are modular and just plug at both the ends into the main body that has the electronics. Dials are big enough to be handled with thick gloves. Offshore quick charger is nice, very nice, compact, charges both Nicads and NiMH, about half the size of Ikelite's quick charger [and it is included in the price! Ikelite take note]. Very fast recycling even at full power [specs state 0.3sec with Nicads]. Costs 1450Eur compared with the 1000Eur of the DS200 here, but packs more power and a better, stronger body and no customs duties and expensive courier costs to ship overseas makes it a good choice for me.
Let's see how it performs under, so far by the tests I have done topside, I am...impressed?