RE: Any regrets?
I've managed to resolve all my problems, and I am really happy with the print quality for the price. Since my initial teething issues, I've been printing almost non-stop for 3-4 days with 3D Solutech PETG from Amazon. Has not skipped a beat.
I think once the initial problems are ironed out, the printer makes a fabulous purchase at the price point that it occupies.
RE: Any regrets?
My main printer is a MK3S which I have since about a year now. The Mini will be a mere backup and capacity increase for times I need to produce a lot as soon as possible. Given the Mini's smaller range in supported materials, it was already clear to me that the MK3S will stay my go-to printer for prototyping, everyday use and special cases, so it doesn't matter too much to me if the Mini isn't quite 100% usable yet the day I receive it. (Ordered on October 14th, so should ship somewhat soon.)
That being said, I am highly worried about the hardware design flaws that become apparent when you check out all the threads on here. Simply because fixing them will require Prusa to provide replacements for physical parts, and I'm not sure if they will do it without hesitation if the bill becomes too high. Consider how many Minis they have already sold and shipped by now.
As for the firmware, I kind of expected that it would have some childhood illnesses and that it wouldn't have all the promised features like Web UI and WiFi support from day one. But missing things as basic as saving multiple print bed configurations - features that already exist in the 8bit firmware, and especially since Prusa even sells the Mini in a bundle with two different sheets - does manage to disappoint me.
All in all, trying to answer your question, I can't tell yet. Prusa needs to show how they will handle those issues first. If they make things right with minimal involvement required on users' part, I can live with the bumpy start. Otherwise, of course, it will be something I regret as my original reason to go with Prusa was, to a large part, that I don't want to find and fix the manufacturer's mistakes myself like you have to with a lot of the cheapo chinese printers.
Wait, 25cm on all sides? For power brick & spool holder? What else?
Whatever you find to do with your hands, do with all your might!