Stylo, let me know how your training is coming a long. I'm in Weston and i've been looking at that MS150 ride also. right now i'm doing much shorter rides but I have managed to get up into the low 20 miles range after only 5 weeks of having the road bike. My only problem is the "fee". they require a min amount of $250 I think it was and I'm not the type of person that likes asking people for $.
as for someone that mentioned climbing...this goes from miami area into the keys. the only climbing we'd be doing is the draw bridge just before Key Largo and maybe an overpass here and there. haha.