While the final release polished Jade’s vocals onto the tracks, the sampler has a raw, aggressive energy that only Keisha brought. Specifically:

Had Keisha remained, Sweet 7 might have been a fascinating, divisive cult classic—the Blackout (Britney Spears) of the Sugababes catalog. Instead, it remains a fractured artifact.

album sampler is a significant piece of fan memorabilia because it contains the original recordings featuring founding member Keisha Buchanan

But buried in the digital graveyards of old promo blogs and eBay auctions lies a holy grail for the true 'Babes stan:

The Sweet 7 album was complete. Keisha’s vocals were on every track. But the label pressed forward with a new version of the album—re-recording all of Keisha’s parts with Jade in a matter of weeks.