The pilot mentioned earlier was quite unlikely to have been an ex Rasher as very few have come out the other end of their Q400 training yet, and those are the ex Q300 crews that haven't left yet.
The IOM-MAN should be about a minute or two longer on a Q400, the extra seats will make for more lower priced tickets and you'll get far larger overhead bins with more room for yourself too.
Glad you liked the 145 though, nippy beast. The Q400 should be an enjoyable ride too, roomy with seriously too much power for it's own good, quite unlike a Q300..