Yes, since you guys mentioned it, Scotch Locks are amazing too. I do plenty of telephone and alarm work and Scotch Locks save me lots of trouble and time. They are water proof too.
I quite like them 3M cable jointing kits,have used them more times than I care to remember. They give a really good seal, provided you follow the instructions. After you have done a few, they are just like learning to ride a bike, really, its simple!. I remember using 4 of these kits all on the same job, and on the same Neutral-Screened cable, too!. Excavator Operators, Eh?.