Phil I run PB Pro with the MS Mod on a 4 car PB, with just the 6 car pb and 2 C7004 power supplies I tried running 6 cars as dummies with random lane changes. I have a total of 4 LC's and when a car changed lane everything slowed down. When I plugged in the slave and one of the power supplies to that there was no change in speed at all and was very impressed. Along with the additional functions of PB Pro I can't see me ever going back to standard SSD. Where are you in the UK? if your close to me I'm sure I could let you try it yourself.