Yes, it's definitely worth attending. The only downside was them not recognising the benefits of the lchf lifestyle, and saying you can eat anything and match it with insulin. However, in every other respect, the course was excellent, and I learned lots I wouldn't otherwise have known. As the days on the course progress, you get extra files for the DAFNE folder, which at the end of the five days is a wealth of info.
I did my course one day a week over 5 weeks, as work would only allow me to attend if I made the hours up on the other 4 days of the week! I also attended the 2hr refresher some months later, where it was good to catch up and check how you were doing (great!). My course was at Fairfield in Bury.
There was a further refresher recently I was invited to, but there were set topics for those days, none of which I felt covered my needs, so I didn't go to those. I use a DAFNE diary every day (quite a shelf-load now), and these are very helpful when checking back to see how certain foods affect me, and what I have done in the past to tackle highs / lows / illness.
Attend the course, have fun, it's not a high speed course and you are given plenty of time to take it all in and ask questions. Also good to meet others who will have similar experiences to yourself.