i prefer the safari top over the bikini top because it gives more coverage and use that in combination with a deck cover all summer long and remove my soft top completely until the fall. i love it. however if you plan on keeping the soft top on and using the bikini top occasionally for those days when you want an open cab feeling with some protection from the sun, i say go for it. they're not that big an investment and you can always sell it if you end up not liking it.
as for the wheel locks, i have those same gorilla wheel locks for my spare tire. it's never been stolen so i guess it works!