Having spent time with Peter and him explaining the system I'd like to offer my input:
Peter is the inventor of the system and the associated guides but he isn't the manufacturer. For that he works with Axminster Tools and they handle all of that as well as the pricing. Peter takes a royalty for units sold.
In my humble opinion Peter is a confident inventor who is happy to promote as well as defend the product. He is also a very genuine person and is just as nice in real life as he is in the videos that he produces.
As a user of the Parf II guide system I can honestly say that the system is very good. None of the messing around with aluminium foil and other such nonsense and very decent MFT inserts can be built very quickly provided the instructions are properly followed.
These two inserts were drilled in a couple of hours and the accuracy across the whole table with a five point cut was far better than I ever expected it to be.
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I haven't owned the Festool MFT and decided against buying one as all of my work is done at home and the Festool unit wasn't sturdy enough for what I wanted. I think I paid about £100 for the black Valchromat and have enough capacity to make three inserts from it.
While the Parf II is expensive it just works so well and, having invested in it, you can build whatever sized and shaped inserts you wish as often as you wish and any decent quality MDF can be used. With a suitable clamp system you can even make something and clamp it to a woodworking vice and have it on top of an existing bench.
As for the dogs - you don't have to spend hundreds at Benchdogs or Axminster, you can buy cheap plastic dogs for little more than the cost of a beer and then adapt them as you wish, should you prefer.
Perhaps a purist and very capable woodworker may see the system as inferior. For hobbyist users or those who value an easy clamp accurate cutting system I think it offers great benefits.