Zoll wins hands down!
I've used a lot of heart monitor/ defibrillators in my nearly 40 year career.
Back in the 70's we carried a LifePak-4 (HUGE AND HEAVY) onboard the 71' Superior 54" at Wilkins-Churchill Rescue One (my first all volunteer squad) I'd love to know where that car is today!
When we moved to van style units in the mid 70's, evreyone was going with what the City of Pittsburgh EMS specified... that being the LifePak-5. The monitor separated from the defibrillator and was a good transport unit.
When I began Foxwall EMS (all volunteer) in 1978, I went outside the box and ordered a DataScope MD-3 (This was the best unit on the market at the time for what we needed.) It was actually a great device!
When we got our second unit, my medics requested a LifePak-5, cause most of them were using LP-5's in other services where they worked full-time.
Given the great customer service we had with Physio-Control, our next purchase was the LifePak-10 an then a LP-11 (although we waited nearly 8 months, as the FDA pulled the 11 from the market for a while)
At some point in the early 2000's we began looking at vendors again and price was a HUGE element. Medtronic/ Physio-Control had a great offering in the LifePak-12, but they were WAAAAAY too much money and would not budge on price. The Zoll E-Series Biphasic was presented to us and I liked the unit very much. Zoll let us test drive one for several weeks and my guys liked it very much too. The deal sealer, was when the President and CEO of Zoll (Richard Packer) came to my station one afternoon in May 2001, with the sales rep. and asked what he could do to earn or business. I told him to "make me an offer I can't refuse!" He did, and the rest is history. We bought 2 units right there and then with all the features available. Zoll took all of our Medtronic stuff replacing it with Zoll and even threw in a non-biphasic monitor/defibrillator for the Chief's car!
Last fall we took LifePak 15, Phillips and Zoll M-Series for test drives again. Most of our medics liked the LifePak-15 and a few liked the Zoll. Aagain, it came down to money. 2 LifePak 15's with all the features were pricing out at $66K, but they would give us up to $8000 each for our Zoll E-Series, making the deal about $50K
Zoll again stepped-up and we purchased 2 M-Series units/ with everything for $38K. We still have the E-Series, which work just fine!
Ask me how I LOVE our Zoll M-Series units!