I got to spearfish most days last week. Which Included some quite good conditions for UK waters; not gin clear but visibility sometimes reaching several metres.
Consequently, finally decided to try out my Apnea Amarok roller 95 speargun

As predicted by
@foxfish, it doesn't feel particularly heavy or bulky in the water

. Although, inevitably, it feels heavier and less nimble than my usual superlight, super-slim Omer XXVs.
Although visibility was reasonably good, I only saw one fish of shootable size while using it (worryingly I saw very few fish of size all week, just schools of too small bass - even the once ubiquitous small Pollock were almost entirely absent) - a plump, lone mackerel swam by quickly, from behind, above and just right of my head. Mackerel here are a small, hard, fast moving target at the best of times but as I tried to aim the muzzle circled around and up and down alarmingly. As I tried to pull the trigger (the slightly long reach to the trigger made it feel more like a pull than a squeeze) the fish took off like a rocket. Missed by a large margin.

I think the problem was my lack of familiarity with handling this speargun and it's difference to my usual light spearguns rather than any problem with the speargun. I practiced moving and aiming the speargun smoothly and firmly after that.
Loading it was ok. I was glad I'd fitted the load-assist loop across the wishbone. I only loaded it to the middle shark fin, I was not used loading to a notch so close to my chest as the rear fin ( a problem with rear trigger mechs. That Rob Allen has mentioned previously). Practice may improve that but there was no shortage of power using the middle fin

.
I found myself having to use one of the 2 methods for loading longer spearguns described in Len Jones' booklet - although only slightly longer than my Omer 90, the draw length is significantly longer. It demanded proper loading technique, no bad thing. A good loading pad helps
The reputation of rollers for smoothness and lack of recoil is well deserved. I had some tangling but not badly and more associated with the second wrap than the muzzle.
Overall I was pleased with the speargun - I will use more. The Amorak without the roller would also be a good speargun I think.
BTW Unusually I experienced a similar trigger mech issue with all 4 of my spearguns on this trip, which I will write about later. Something to be aware of but nothing to worry about. I also had the same issue with my old Rob Allen railgun too.