Re: Colour me dubious
incompatible schemas between legacy system 1..N and the destination system
True, which is why the single most important thing is to define the interfaces. Get that right, and everything else falls out OK. All too often this sort of rollout starts at the wrong end, picking systems & software, then trying to work out how to plug them together.
I actually have quite a lot of faith that JL can do this, it's a business that works because it knows its customers, and what they expect. Hopefully that will translate into being on the other side of the deal, but time will tell.