Ok, then I'll better stay with my Idefix Express. Very reliable and reasonably fast.
No need for PIO5 anyway. Even PIO3 would probably be sufficient. Just look at the maximum transfer rates:
PIO0 - 3,3 MB/s
PIO1 - 5,2 MB/s
PIO2 - 8,3 MB/s
PIO3 - 11,1 MB/s
PIO4 - 16,6 MB/s
PIO5 - 33,3 MB/s