BP with the 27.5 Future yesterday. Got about 300 hits on it now. In my opinion, it just passed up my OG z2k el. At least for me...and my swing...for now.
I use a Garmin 310. It comes with or without a heart monitor. I don't use a heart monitor. I have been happy with it. It has been more accurate and dependable than my phone app. Also, it is waterproof...so I don't worry about ruining my phone.