The VRM is a nice little unit. I use it when mixing on my laptop while I'm traveling. If you check your mixes on the VRM using multiple speaker emulations and you mix sounds good on all of them, your mix should be OK. Each emulation has its own character, some bass, mid or treble heavy. So when my mix sounds balance on all of them, it usually sounds good on my studio monitors also. Not to mention, mixing poolside isn't bad either.
Kevin