I've had a quick look at the stats on my Raptor, it has Mk XI Borg Polaron cannons and turrets on with a leech console.
Before : 1177 DPS for a Dual Heavy Cannon
After : 1198 DPS
Leech Before : -2.5 to target, +2.5 To myself
After : -2.7 / +2.7
Polaron Proc Before : -43 power drain
After : -46
I didn't note down the energy siphon stats but I would assume a slight improvement judging by what it's done there.
Everything I have fought in PvE is weaker, you can see it in the slower movement and the lower damage their energy weapons cause.
I'd say for hit and run tactics (BoP / Raptor / Defiant-R) it's not a bad build, but a lot with rest on what the shield will do when we get it.
I have a full energy drain Carrier set up I use for PvP, I will have to check the stats on it as it runs lower weapon power, so I would get the power boost from the set as well as the extra damage and draining ( Polaron turret setup for the proc)
My noobish self evaluated the stats of the Jem'Hadar shields and engine as suited for a tac & not so good for a sci.
Are you talking about the new items from the 2800 FE or am i confused? I ask because as far as i knew the ship shield was not yet offered in the current episodes. Most recent ep gave me option of a engine and sensor array.