(Next time I am bringing my Wagner)
All in all it reminded me of playing larger multi player games back in my days of playing WFB. They are the fun to do on occasion but they have the same problems in my opinion. Basically it comes down to how fast and comfortable of a player you are, in order to have an enjoyable game. I would not call myself an expert, and I feel that I need some more experience in standard 40K before I take on another Apocalypse game. Thus the reason why I don't recommend a game like this to anyone until they get experience in playing. Playing fast and confident is a requirement in order to make the game go smoothly in a game like this where getting bogged down is easy to do.
On another note, I am not sure that having different number of players is a good thing. Usually when I play these games, I am usually ranking up against one guy and we never finish the game to the last model, so I rarely ever get to play other players in a game like this. This is different, since I was in the center and attacking both opposing players at once. The fun part is that I distributed playing against each other, but the bad news is that I have to vie for the attention of my opponent with my two other cohorts. This lead to some confusion and having us wait on each other.
All in all I would do it again, however like always, I want to try to do it with just me in command of the army. It is one of things that partners in this situation causes hindrances to each other. Like the old saying "Too many cooks spoil the broth."