I've only looked at them, Bryon so I can't comment on reliability, durability or charge rates beyond hearsay.
I CAN say..
The spray gun surely looks better compared to the Multi-sprayer and HF electric we use.
The biggest thing that stopped me from taking one home, was it's physical size.
For the solution capacity, it seems a bit large and would be cumbersome to use in res.
I saw they were on sale recently in the Interlink supplier's catalog.
Think I saw them for $350
..L.T.A.