A fiver@BigJase88 - Cheers big man. I'll give you a nod once I've made my mind up which version I'm going for. I see the referral amount is in a tier system based on which model you recommend out. 60 quid is for the GTS Black. The S model which is what you've gone for attracts a £5 referral payment.
@GeoffGeoff - I've sent them a message asking about the mid range one. There isn't a great deal of difference between it and the one BigJase has ordered other than app support and marginal power gains over the S model. I've asked how the app will adjust the box if the unit has a rotary selection dial. I can't get my head around that at the moment...

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i’m thinking it might go like
S model adapts one sensor
RS box adapts 2 sensors
GTS box adapts 3 sensors
But then i seen on youtube the GTS box only has 2 plugs. So sortov blew that theory out of the water