look I dont mind paying for a good quality products that also come with great customer service, BUT when I asked how much to fit a second pump (so me and a lad can work together) to my system (a well known brand - you know the one not gonna mentiion any names but heres a clue...Ironic) to include a vairflow switch, battery and split router to charge when driving plus 4 hours work at £45ph I was quoted £700!!! so that £520 just for the 'equipment'...
the question is not could this be done cheaper DIY, but is this a fair price?