Their cost vs Porsche oil change cost at a dealer is pretty low. Also nice is their analysis of engine wear based on elements found in the oil. For my Lexus, an oil change is only $55 at Toyota which is why I just did one analysis and just did a change at 7.5k. With Porsche being so high, an extra 2500 miles is worth more than the Blackstone cost.
I have not had it analyzed but plan to. If you do the oil change yourself, it's about the cost of your Lexus oil change experience and you get to dink around with the car, which I consider fun. I agree with Georgeair that the analysis is the logical thing to do but I see no harm whatsoever in changing the oil more frequently until the analysis.....