Anyone have experience with Hensel Tria packs?

Anyone have any comments on the Hensel Tria power packs/heads? I'm looking for a more powerful outfit, and they offer some very powerful packs for not too much money. What's the accessory situation for them? Right now I have some Calumet Travelites which are more than adequate for the space in which I'm working, but I'm looking to increase my camera size and start working with some very very slow emulsions (wet-plate, maybe daguerrotypes), and so I will need a LOT more power than the Travelites can deliver.