I did it, I bought a set of traxxas lipos. My LHS gave me a decent deal on them, still expensive though. I bought a pair of 2s 10,000mah lipos for running in my Spartan boat. I'm not sure of the msrp on these but they where marked for $129.99 each, I was able to get them for $99.99 each. At this price they are similarly priced to NeuEnergy packs. Still a bit more than Turnigy but Traxxas has a good warranty on these packs.
Here is a graph from the first run on these packs. Wide open until the lvc, there are a couple brief dips, for some reason I seem to lose signal on occasion in a couple spots on this small lake, not all the time but it's the same couple spots everytime it happens. The packs seemed to do well. Are they an honest 25C? I guess it all depends on how you rate them but I can say that at contant 60Amp load they they held above 3.4V/cell right up till the last 500mah of capacity, and they gave up full advertised capacity.
Same graphs just one shows cumulative mah and one shows time. About 9-9.5 minutes of all out running.
Overall I'm pretty happy, we shall see how well they hold up over time and how well Traxxas stands behind their warranty.