Buyers in the pilot market were able to book top-up staff very precisely hour-by-hour in exact line with need. Together with the low overheads, this let them purchase extra workers in ways that would otherwise not be viable. Because they could instantly select provenly reliable workers they had peace of mind. (Those sellers command a premium payrate, but that's partly what keeps them so reliable.) Several of the pilot employers inducted a pool of Slivers-of-Time sellers so they had additional trained workers constantly available. These marketplaces make this kind of group induction uniquely cost effective.
What's the impact of booking a bigger pool of workers very precisely (even at a higher payrate) over several months? The BBC came to East London to look at Slivers-of-Time marketplaces and put that question to the biggest buyer in the market at that time:

"In April through to August we bought 690 hours through Slivers-of-Time. The total cost was £5,042. With our normal overheads we reckon that would have been £8,280. That's a 39% saving."
As hiring extra hands has become so cost effective for East Thames Group they have been able to launch new projects. Their board recently voted in favour of a 'Paper Light' project. Years worth of old records are to be unearthed, scanned and archived, all by a pool of inducted Slivers-of-Time sellers. It needs to be done this way because supervisors and scanning facilities are only available intermittently around other company priorities. Without Slivers-of-Time Workers this project would have been prohibitively expensive.
Some other buyer case studies: