Why do you hate the newest Joule? I do assume you talk about the GPS one. I'm using a P2Max myself and just did sent back my Joule GPS because of condensation building up inside the computer face. I'm back to my old Joule2.0 and like it a lot better since the GPS of the new joule sucks anyway. I was thinking about the PC7 myself and it should work since it is ANT+ but I did read a lot of people didn't like about the SRM that you don't have the option to see NP, IF, Avg Power on the display during intervals.
That is really a turn of for me and the only reason not to get one and pay such high price for the PC7.
I do think that the Joule is one of the best ones out with all the data you have on one screen and also changing between screens is very easy.
The reason I dont like my new Joule GPS is: The screen figures are too small, i hate the auto start that never works for me, the handlebar mount is lame and I feel that the computer is going to fly into the next ditch, the buttons and interface are not so Intuitive like the manufacturer meant. I just love my old PC5 computer, its simple, clear and located in a firm way on the bar- the biggest issue is the battery, why should I pay 50$ every time that the bat is out of life.
The reason I ask about compliance between P2M and the PC7 is the slope, how do you know what is your P2M slope, how they work together..