Originally Posted by LocoSombrero
Good point - I only did install the KickROM 3.x as I was thinking of getting a HDD-card reader adapter/accelerator board, i.e. the ACA500(plus) for my A500 (I've understood that Kickstart 3.x is needed for this), however the ACA500 boards are all long sold out and ACA500plus is due to be available ("maybe") later this year.
ACA500 comes with both KS 1.3 and 3.1 included which can be chosen in the boot menu so it does not care which physical ROM is installed. Its KS is also fixed to support larger drives than the standard KS 3.1 can handle which would otherwise be the reason to choose 3.x over 3.1.