while i was only introduced to the Babes during their "Round Round" time, and i still think that without Heidi's involvement, Sugarbabes with Keisha and Mutya alone wouldn't be the same compared to their time with Siobhan, whose music (Siobhan's) lean towards the alternative/experimental compared to the more urban sound during the time with Heidi.
but yeah, still waiting for anything new official releases from them all.