Other people have reported that above 70w or so, it fires a little under what it says it's firing at. To be honest, there's not much that can be done about this.
sketchness is right, compensate for what gives you the most enjoyable vape. Doesn't matter what it says, as long as it's comfortable to you. I have been lovin' my IPV3 (although I've been using it for 1ohm+ builds). I find it really shines at about .8 or so.
The display voltage is off. It displays up to 8.2v but the chip and all the specs say it only goes to 7v. I have gotten it up to 7.2v on my multi meter. I suspect they will correct all of that in a firmware update. With 0.33 ohm coils and below you will get 150-160 watt actual. I have built all sorts of coils and tested it for reference. I had a Cloupor T8 before this and I could never get it above 70w actual. At this rate you will get a better vape than a mechanical unless you are exceeding your batteries or have a parallel and can pull more than 35-40 amp on below 0.1 ohm.
0.12 ohm "Tiger-ish" coil (twisted 24 and 28g)
75w display says 3.1v - 3.07v 78 actual watts
100w display says 3.6v - 3.41v 97 actual watts
150w display says 4.4v - 4.17v 145 actual watts
0.32 ohm "Tiger-ish" coil (twisted 24 and 28g)
75w display says 4.9v - 4.86 74 actual watts
100w display says 5.8v - 5.70 101 actual watts
150w display says 7.0v - 6.83 146 actual watts
So its getting close enough that you wont be able to tell. As far as vapor goes you wont even get a smidgen of more performance at your 4-5 watt loss on the high end.
I did this test with just the bare coil, no wick and no juice. I actually melted the coil on the last 158 watt run and it broke.