50% more? How so? What calculator did you use to figure out 50%?
The part you quoted said $1150 for Perdix + transmitter versus $1500 for iX3M + transmitter. It's not really 50% more. That's just a very rough ballpark number. It's actually 30% more.
I have a mobile phone with GPS and used to use it and always worry about water splashing on the phone and ruining it. Hasn't happened to me yet but it happened to other friends. With the built in GPS, the iX3M computer does it very nicely completely wet and I don't have to worry about remembering to bring in my mobile phone while trying to dry my hand or keep it away from the water. I paid a lot more for my mobile phone and I certainly don't want to spend the money to replace it.
My phone is waterproof (against only splashes or drop in a puddle, of course). And I keep it along with my electronic key fob for my truck in a drybag on the boat. No need to take it out at all while on the boat, for the Subsurface location service to work.
Ditto for SUUNTO. Remember that they have a "special" transmitter for the Steel and I presume Core too. What a dumb move.
I don't think that it is an "industry standard" at all, several other vendors use different brand/make transmitters and are very successful with it thus far. I won't and don't trust that AL will continue the honeymoon with Oceanic for long and only God knows about Shearwater. I believe that Ratio did the right/smart thing by developing their own product in this specific area.
At least Suunto and ScubaPro have a history with AI. They have a track record that people can look at to decide if they want to trust their AI transmitters.
Shearwater's deal gave them AI with a history (of pretty solid reliability) with the stroke of a pen. Brilliant.
Ratio does not have any of that. Investing in Ratio AI is somewhat of a gamble until their AI has been around long enough, and used by enough people, to really show whether their AI is as reliable as their competition's. And also to show how well (or poorly) they will take care of the customers who do have issues. EVERY company has customers that have issues. How the company handles it is an important part of the buying decision to many people. Shearwater has proven time and again that they take very good care of their customers. So far, from other posts here on SB, I would have to say that Ratio has not yet proven themselves to be so committed to taking care of their customers. The jury is still out.
You don't have to consider the PPS transmitter to be an industry standard if you don't want to. But, like I said, it is the ONLY AI transmitter that I know of that can be used by multiple different brands of computer. Aeris, Oceanic, Hollis, Aqualung, Sherwood, Tusa, and Shearwater. ScubaPro AI? 1 brand. Suunto AI? 1 brand (that recently issued a recall on ALL the AI transmitters they have ever made). Ratio AI? 1 brand (with a pretty short history, so far, to be able to judge them on). Liquivision AI? 1 brand.
I think Buhlmann ZHL-16C w/Gradient Factors algorithm is supported on less computers than the PPS transmitter is, and I would call it an industry standard algorithm.
Obviously, just because you say something is an industry standard does not mean you are saying that EVERYONE in the industry supports it.
Of course, if something happens and Shearwater or Oceanic somehow loses the ability to sell their computers with compatibility with the PPS transmitters, then I will just have to eat my words!