Well, I'm the guy and its not just a cable... I draw the circuit by hand, etch it, and drill it... quite time consuming. I also include a full page of illustrations and full instructions. I label the circuit and label the parts. If you're in the business... you can easily make one. My kits are for those that aren't experts and want something they know they can put together easily and correctly and they know it will work. I've not had anyone that has mentioned having any problems with the kit. Parts for this kit, unless you buy in bulk will run you around $15-20. If you want to do it yourself, an etch kit alone runs $15 at radio shack. I think you find that anyone that has got my kit, has only positive things to say about it and thinks the price is great. I post everyone that has a response about my products under customer comments on my site. If there is anything bad said about them, you'll find it there. There another thread on this board about my kits also if anyone likes more feedback. I'm not forcing anyone to buy it either. If you anyone is willing to offer kits at $7 - $10 each, please do so... and show me how you do it while you're at it. Also, with the kit, most people can "build" it in less than an hour. I make this last request... if there is anyone in this "industry" that offers a cheaper alternative of the same quality, I would love to see it. How can anyone knock the cheapest thing out there? Go to anyone's site that has the plans for the interface and get the parts list and go buy the parts... if you can find them all. Build it. Tally up all your costs and your time and see what you come up with. It'll take you an hour to get the circuit board made... if it comes out right the first time... Sorry for being so long-winded, but all I'm offering is the cheapest, and easiest (those two words don't usually ever go together) interface solution and I can't for the life of me see why there always has to be one person that says something negative. Buy the kit if you want to save money and easily make an interface, buy it from suunto if you want to say something is overpriced... I'll sell anyone the "parts" for $10 if they want them. Unprinted circuit board, enclosure, and all the parts, $10. No instructions, no illustrations, and no help from me if you have problems. I don't think I'll have any takers...