Ive tried it a few months ago, I was pretty much unsatisfied. There are a lot of reasons a beam escort isnt that great of a choice.
- You have an escort because you want to deal damage, notably you want to deal most damage in your frontal arc, which can only be 100% ultilized if you have turrets on the back as well.
- Your escort has a higher turnrate, so its better to fully utilize them with Dual (heavy) cannons or a mix of cannons/Dual beam bank/Torp. (So using beams on it is kinda wasting your potential)
- You have less options to choose from in terms of Bridge officer skills. You will be able to use Beam Overloads on an all-beam escort, but you will not be able to make use of Rapid Fire etc (i.e. RF3 gives +50% damage to your cannons/turrets for 10 secs) with it.
I personally think that a setup with full cannons/turrets + a Dual beam to make use of Beam overloads is the best way to go. (And you can even add a torp to that if you must)...