[lady_godiva]

if you need to crack WPA i agree that if the router has WPS active then reaver is the best solution as with an upper bound of 10 hour the PIN is likely to be recovered. Some methods at research level have been proposed but no successful implementation could actually be made.

Cracking WPA or WPA can be infeasible if a strong password is used, however consider that many users set their own weak password which can easily be cracked. Many still use the ISP assigned password that most of the times can be cracked with specific algorithms. The only reliable password are the one chosen by the user with security awarness (according to reports not so many).

Be also aware that a determined attacker can actually perform bruteforce approach trying all the possible combination. This can be achieved by renting a cloud computing system (affordable nowadays) which can highly speed up the cracking process spreading the work among different machines. Consider also CUDA-like approach that speed up the bruteforcing problem a lot