The Kreg K4 jig is very handy for setting up and making pocket holes to accept screws. It is quick and easy making relatively strong joints. The only downside is a rather cumbersome clamping mechanism. It has to be adjusted to timber thickness and is fiddly.
There is a more advanced jig called the K5 but for my needs the K4 is perfectly satisfactory. Currently the K4 can be purchased in Australia for about $140 and the K5 for somewhere between AUD $220 and $299. I bought my jig some years ago and paid around AUD $100. The Aussie dollar was stronger then.
I was very pleased to to see that a company Armor Tools offered an upgrade to the clamping mechanism. A quick and easy upgrade that really works. It was less than $50. even better the K4 still fits in the original box. I have included a video link to the company video on this product. It is available in Australia from Timbecon