I’ve been waiting for a product like this for a while, so will deff buy one when they become available.
But I do think some of you are being a bit hard on davvey. I can well imagine that using a second fully charged unit to completely “pop” the bead into place could damage a tyre. Loads of times I’ve had to pump a tyre, especially a dry one, up to its maximum pressure before its completely seated. Sometimes not even then and the washing up liquid has had to come out.
When mine comes I’ll use it to get the initial seal, then inflate it gradually with a track pump to completely seat the bead.