The APX fit my narrowish head perfect. Luckily my helmet can be worn a bit further back without risks, so the goggles fit. They go rather high.
Peripheral vision is great, but I haven't much experience with other higher end goggles to which I could compare. The smaller version definitely limited vision, but you were obviously going to skip them anyway. APXs definitely fit me better though.
One let down of the frameless design is that they scratch quite easily. I take my helmet off and together they tend to roll over for some hits... Nothing major, but should keep in mind.