JC,
I have never seen a Mariner seaplane fly so can't compare the two. All the guys I fly with use Seamasters or their personal creations of a Seamaster. Matt was the first up here to electrify his and then I did mine.

I am pleased with the performance of mine. See the video of my second day out (three flights) and you can decide if it has adequate power for your type of flying. I had one of my flying buddies fly it so I could get some video.

http://www.modelaviators.org/2008/Vi...SeamasterE.wmv

Joe
Specs:
Electrifly Rimfire 42-60-600
MA 13x8.5E prop
CC Phoenix 60
CC BEC
TP Extreme 5S2P 4400 mah

Max watts: 807
Max amps: 46.25
Mah: 1944 for a 9.5 min flight.
Not even 50% of battery mah.

AUW: 125.5 ozs