Excellent in all respects. I shipped my car’s DME to test, as I (and BMW dealer) suspected it was faulty. They tested and confirmed it was fine, no issues and shipped back. I reinstalled and car experienced same intermittent misfiring issue with injector #1 problem code. Had BMW dealer check again, and at first they still adamant was faulty DME. I questioned how can be, if just had the DME tested by ECU Pro who said it checked out fine. BMW tech then said would double check all wiring. Called me back few hours later and told me, after additional testing, confirmed DME is working fine, but there is issue within wiring harness. Unfortunately, must replace costly wiring harness. Won’t know for certain if wiring harness is in fact the root cause until it’s replaced. However, at this point in time, it appears that ECU Pro’s test results on DME were correct. Very good end to end experience dealing with ECU Pro.