Some answers.
If you bang your watch on a wall, it is evident that you may damage it.
It is not adviced to practice sports with your watch, with any mechanical watch, by the way. Think about it, when you play tennis, or golf, the rotor and the delicate parts of the movement will be in danger at the moment you hit the ball...
But you can swim and dive with it without any fear, of course.
The Cal 1315 is a very good movement, but a Rolex would be more accurate.
As for the resale value, it should not be your most important criteria. It is less easy to resale than a Rolex Submariner, for example.
Buy it because you love it, not because it will keep its value.
Best,
Nicolas
This message has been edited by amanico on 2012-11-02 15:14:20

I've had three FFs - all the regular Sport model and still have two
No problems and they have all been accurate, between +1.5 and +3.5 /day with no special resting position overnight
The long power reserve (120 hrs +) is great for obvious reasons, although the watch is a pleasure to wind
Blancpain is well-supported in Australia, with service centres in Melbourne and Sydney and my local AD is helpful (even purchasing their own strap-changing rig and changing customer straps/bracelets for free). Servicing is done by category and the costs are around the same as for Rolex. Only the Category 3 and above (high / grand complications need be returned to Switzerland). The US experience may be different.
Not really sure about resale... I imagine to figure on a drop of about 40%, possibly a bit better than other Blancpains. Obviously comparing any watch to a Rolex Submariner in regard to resale will be unfavourable.
Good luck : )
This message has been edited by Psmith on 2012-11-02 18:45:22That TtAL looks so good on your wrist, I keep coming back to take another look : )
Just a suggestion... If you prefer a brushed finish there is a new FF available (shown at Basel last year and now on the Blancpain website), ref 5015D-1140-52B
Same hands and bezel as the Sport version, but in a dark blue and with the same satin-brushed case as the TtAL. The dial has the same finish as the complete calendar chrono model (blue flinqué). Solid caseback and antimagnetic as per the Sport version

I have not seen the dial in real life... well, actually I have (sort of), on the Complete Calendar chrono
I like it, although I expect others would prefer a plain dial like that used on the WG LE
I think it's good that Blancpain are giving us a choice, whereas a steel Rolex Sub (for example) is only available in black or green