I have got a 450 Escape with a Yammi 50 4 stroke, and the wife and i regularly fish well beyond the shelf and tangle with +150kg marlin, deep drop etc. They are a capable little boat, handle big seas surprisingly well, great on fuel, easy to tow, store and handle.
But they are a harsh ride when choppy and the wave period drops, they don't have a whole lot of deck space, and can be a wet ride.
The 520 Formosa is a great boat, much nicer ride and the wife will be more comfortable in this boat.