is the difference only cosmetic, mainly grip? if so why aren't there people raving over the firestorm all the time like they do the thunder? i've had my firestorm for over 6 years(about 4-500 rounds through it) and i love it, never had a problem with it. but i recently purchased a glock 17 and now considering trading up the bersa for a glock 19 or 26 to be my glove box/tackle box pistol. my whole point is you can't find many people looking to buy a firestorm but plenty looking for the thunder. thoughts?