I've done VO2 max testing at least 4 different times and I'd have to say that it's always been enlightening. Though once I got used to using my HR zones from the VO2 max testing in conjunction with my HRM, I got a good sense of where my zones are by feel and now I rely on my perceived exertion more than an HRM. Getting the VO2 max done and using that data with the HRM was key for learning that skill.
Living life like there's no tomorrow.
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2007 Look Dura Ace
2010 Custom Tonic cross with discs, SRAM
2012 Moots YBB 2 x 10 Shimano XTR
2014 Soma B-Side SS