I've got a Pure Highway H270SB (well had 4 of them in total) though not in a P38. I wouldn't recommend them as I've had 1 of the 4 fail under warranty (DAB tuner totally gave up), another fail out of warranty (bluetooth drops any connected device after 10-30 seconds of use) and the other two work for the most part, though are prone to the DAB tuner throwing a fit every so often and needing the reset button pressing, which removes all your presets.
Actually to say the remaining 2 still work isn't entirely true, one of them the select button take a few presses to get it to select a station. Which combined with the routine resetting they need, is more of a pain than it might at first sound.
The highway sounds like the better option (the one that broadcasts over low power fm radio) though having seen inside a couple of other failed Pure radios, I don't think the quality of their kit is particually good personally. Though I'm not a fan of touchscreen operated car stereos in general, buttons are easier when you want to just operate it without having to look at it. The Highway 600 might be better than the original (which I've also used briefly).
I've had a couple of JVC stereos and they have been good - the only downside to them is the way the DAB tuner works is a bit clumsy compared to the Pure ones, but once you get your head round how to work it they work very well. Only reason I replaced the original pair of JVC stereos I had for vehicles was they lacked bluetooth or any form of Aux in port. The handsfree on the JVC is a lot better than the Pure ever managed, it seems to do noise cancellation a lot better than the Pure and is clearer to hear the other end of the call as well. The highway 600 may be better in that respect, but I'd be unwilling to give Pure any more cash given what I've seen of their kit personally.