I run two Marlin HP's and a pair of Mag20DT's on my boat, all with telescoping booms.
As ScottB pointed out, they have a fast retrieval rate.
I had a problem with one of them (had to wiggle the power cable once inawhile to keep power to the unit). Of course, this was during late August, so I waited until the end of the season and took care of it.
Additionally, I had heard that the touchpad keyboard can build up moisture and sometimes fail (hasn't happened to me).
I have alot of hours on mine. If you can get a deal on them....go for it, I don't think you will be sorry