I uses them all the time.
They are great. You can do ONLINE edits with them. The V7 is better then the V6. The software can be difficult to learn.
They cost about half the price of AB PV's and do twice as much.
I have over 12 of them installed on control logix plc with no troubles.
I find RSview is easyer to use then Hakko's version (Telus).