Anyone drink "Huel"?

My brother is interested in trying Huel. Currently he has a Slim Fast shake (made from the powder) for his break at work, but his research says that that may be the worst of the meal replacement shakes on the market and Huel would be more substantial.

Just wondering if anyone here drinks it whether they think that it feels like a meal afterwards, and opinions on the various flavours (particularly the unsweetened/unflavoured variety and the new vanilla vs the old vanilla).

As he would be a new customer they would give him a free shaker and shirt, and he can't find a way to remove the shirt (he would never wear it). Also any tips on getting it cheaper?

Thanks much