Dangerous I know

but been thinking in the new year to pick one diet plan and stick to it rather than doing a DIY job.
Slimming world is obviously one of the more popular diets, but do many guys go to the groups? There is a group that meets at the kids school but think I'd rather find one a little further away so I don't bump into locals
What happens at the group? A lot of info seems to be free on the website. Wondering if to give it a go with or without the group.
What are the pro and cons?