I recommend Loctite Blue. If the threads are clean, it won't back out by itself. You may not be able to disassemble it later if you use Locktite Red.
Turbofins should be no problem. Make sure you insert the masts fully (measure them after installation) and use Loctite blue to prevent backing out. The only problems I've heard of is due to improper insertion of the Drive where the nose of the Drive protrudes under the boat. This prevents the rear fin from clearing the well and it can tear away from the outhaul clew. Standard fins are more durable and can usually withstand such mistreatment. the 2012 model Drives have an alignment pin and grove that prevents this problem, but if you pay attention, this won't be an issue for you on any of the previous year models.
When installing Turbos, a common mistake is tightening the outhaul clew. It should be loosened to where the back of the fin base just rests inside the slot of the outhaul. The instructions (at least in the past) don't tell you this.
Most users really love their Turbos (including me).
