Kreg with me also.
Can't remember where bought (internet) - but not eBay.
Got good deal for the 'complete' kit + box of each size of screw + the long clamp.
Although vaguely knew about pocket 'jointing' - never used the method.
Had job for built-in shelving. Had to join 230cm x 20cm x 3cm uprights, to 40cm x 35cm x 3cm. There were 6 uprights - 12 pieces.
The 'shorter' piece was to be at floor level (for extra stability, and, deeper books) with them being shaped to 20cm at the top edge.
(Hope that makes sense.)
Had no way of clamping the two 'planks' together (end to end) whilst glue set. Was paranoid about getting a really strong, true joint - uneasy about doing it at all. Potentially, a lot of weight on those shelves.
Happen to have read another thread where Alan M ( probably others as well) saying how pocket holes jointing useful for clamping.
So went for it. Even now can't believe how quick and easy to use - something else should have got years ago - along with Festool sanders.
One good tip, from Kreg forum, was to vacuum the holes out before final assembly - if any wood dust in holes, can force joint apart a little as screw tightened.
Might be helpful to have a look at 'Kreg Jig Owners Community' site -
http://kregjig.ning.com/ .
Richard