I have the Mackie HR824's. They sound so good that they make a bad mix sound good. You have to keep that in mind when you mix. You need to take the mix to the car to hear it in crap environment.
I went to get some stuff mixed by a 12x platinum yadda yadda yadda engineer as was astounded to see that he used a pair of Event ASP-8s for his mixing... No farfields, no NS-10s, no ADAMs, just those... Which I always found to be terrible when A/B'd versus just about any other speaker in that price range on the market (very muddy). Guess it just goes to show that its all in the engineer, not the monitor.