I liked the Commander packet I’d made for my Halloween Cube, so did the same for my Shakespeare Cube. The packs cut down on draft time, and I could ensure everyone got X, Y, Z type of cards (like making sure everyone gets a Planeswalker).
But I was unhappy with the packet balance, so I decided to try a combination: a draft round, but with packs made up only of legendary creatures and Planeswalkers (and keeping the partner mechanic). I only had enough cards for 4 packs of 15 cards; we actually had 5 players, so each pack had 12. Then we did a regular draft of 3 15-card packs.
Overall, it went well. Draft still went fairly quickly, and everyone had a larger pool to draw from. My main concern is number of players: the packets could support 8 players, but draft probably hits a wall at 6 (10-card packs).
I like the partner mechanic, though, and will probably use it in the future, which means drafting this way will probably continue to work.