I picked up an Epix from H Samuel using discounted vouchers from our works reward portal.
The 16 days battery life is accurate and I’ve only charged it once after the initial unboxing (about two weeks ago) as you need to be on charge to download the maps.
The speed at which it wakes means I see no need to have it on all the time.
Initially I didn’t want a big watch but middle aged eyes forced the issue. However the epix is much lighter than my smaller steel watches so I don’t notice it’s on my wrist.
Haven’t tried a Fenix but I don’t regret buying the Epix.