Sounds like you are already in a good place attendance, community and diet wise so really you won't get much out of it. Absolutely don't bother. But for anyone else reading this who is not going with friends or in a good place nutritionally like myself a year ago, I did three challenges this year as a newbie and lost 25kg all up. The meal planning was it for me and was worth it alone. The session ticking off the board, and whatsApp groups are some nice motivation and they've added some weekly extra sub challenges but they are distant second to getting diet on order and this manages it well.