I have 2 Kreg jigs. One is an inexpensive 2 hole blue plastic clamp on, and the other is an older aluminum jig with an adjustable clamp built in. The one pictured is not mine, but identical to it.
I am told this is the original K2 jig by Kreg. I love the old K2, as it is fast for production. The blue one is great for ad hock hole drilling and 2x4 or long stock drilling. The new one is much more versatile, while the old one only does what it does (3/4" stock) but does it well.
I also have a biscuit joiner. I love it too! Biscuits are great when both sides need to be pretty, but I don't trust them on end grain to edge grain joints. Pocket screws excel at end grain to edge grain joints!
I really began to appreciate the biscuit joiner when I read an article in one of the various woodworking magazines that stated I should be using the table top, not the stock top, as my reference point. Once I started using the biscuit joiner correctly, I have found it very handy. Made this table for the side of my weekender with it. The redwood is 1" thick, the pine 3/4". Using the table as the reference, and building it upside down, and it came out great!
Note: I used tongue and groove redwood for the support piece. It didn't have to be as pretty.