I just did my first PS-32 upgrade last week. I installed it in a F7 ABA set and used the original slave board for the trailing A. It was a pretty smooth installation. I did lower the board mounts but that was pretty easy due to the fact that there is no battery.
I think this design is pretty cool and will open up some other possibilities for those of us who like to tinker. I do wish we could use the PS3 sound files. Some of them are better than the upgrade files.
I also feel that these kits will be well worth it if the cost increase is not significant.
Dave