I am new to this forum, but have been involved with Pico tools since the mid-2000's. My background (as then) was with a major vehicle producer, although I had to buy my own 2-channel auto kit with my personal money back then! I got a lot of use from that kit whilst working on new engine projects, hoping that one day I would be able to convince the Instrumentation department at work that a Picoscope was an essential part of developing the calibration on those engines -sadly they were too short-sighted and tight-fisted. Having retired to the Highlands, I have gone into automotive diagnostics on my own as a one-man-band business; no question here of there being a gap in the market in the remote areas, anything electrical is a problem to the majority of independents. Two years ago, I upgraded to a 4423 Automotive unit, and expanded my 2-channel kit accordingly (extra attenuators, leads, etc. etc.) Although money is tight for such a remote operation, the workload is as much as I can cope with, and the Pico kit just keeps earning its living - being universal across the customer fleet, there is no problem of redundancy of equipment every few years, like scantools. The best aspect of working on your own is that the purchasing decisions are easy; if you can justify it, see the payback, and can afford the kit, then there is no long and drawn-out argument with the "trolls" in the Finance department.
I hope to post elsewhere with a particular issue I am having on piezo-drive diesel injectors.