Dave. Awesome - in a word. Not fantastically cheap, especially over here. The Turbo recycles a Metz 45 in one second at full whack:)
For sustained fire nothing beats the Turbo, however for short bursts you might find several sets of NiMH with appropriate battery holders (AP1 for 283) a more reasonable alternative. I am not certain if you can use NiMH in the Metz 45 holder - someone from Hasselblad (the UK importer) once did tell me why it was not recommended to use nicads therein - of course now those brain cells have gone.... Tom Van Veen is probably the best man to answer this. Kind regards Peter