The analogy of 1950s teenagers hot-rodding old Ford Model T comes to mind;all these non-Commodore accelerators change the machine in ways never part of the original.What we may end up with is a higher performance machine that has little in common with the original.If one replaces the engine(cpu),the transmission(bus board),the wheels and tires(graphics card),the steering wheel,gearshift,and pedals(new usb mouse,keyboard,the gas tank,(memory),the seats and dashboard(display and GUI),neither machine is really a Ford(Amiga).
Both were popular machines and both are limited and considered rightfully obsolete today!
Both are nice hobby machines to be rolled out at shows and quiet weekend s,neither is ready for any superhighway.
If one wants a high performance machine for today AND insists on being "true" to the original then a new Mustang(SAM 440) is probably a better way to spend money.
Not so incidentally,I plan on thinning the herd here soon -have 15 or 20 Amigas and rarely use ANY of them anymore.Maybe I can raise enough funds for a SAM.