Hi Officious,
I don't have any R&I kiosks anywhere near me but last week had the opportunity to sample Flavor Burst first-hand at a brick and mortar Zesto's. I don't think it would have caught my eye if I hadn't been already aware of the Flavor Burst brand. It was part of the advertising at the small Zesto's restaurant here. They have more than a dozen flavor options; I tried the raspberry and it was good IMO. Flavor Burst appears to leave a characteristic rim of flavoring that is evident along the outer edge of the spiral of ice cream, at least that is how I would describe it. Although not mixed throughout the ice cream, it provided good, consistent flavor.
Hope that helps.