Well, plenty of people in metal play actual Les Pauls, so it's not like you can't. I have Fishman Fluences in mine, blacked out the hardware, and now it's a metal beast.
The thing about Eclipses and ESP's in general for me is how they feel. They kinda sorta feel familiar if you're used to Gibson 60's necks (and not as closely, but perhaps some elements from a Fender/Charvel Modern C), but they feel more modern. They don't feel like Ibanez's either. They're kinda their own thing.
Imagine the necks sorta like a sleeker, slightly narrower Gibson 60's with HUGE frets and impeccable fretwork. Same sort of quality and playabiity as you'd expect from Ibanez Prestige, only on a completely different neck profile that's thin and comfy, but not flat or paper thin either. But more along the lines of impeccable build quality instead of the hand-made mojo that Gibsons have.
They don't sound bad either. Honestly, the good ones are not far off from actual Les Pauls, but there's still something that's unmistakably Les Paul about a Les Paul. If you want something that does a good Les Paul-ish sound impersonation, but that plays like how a modern sports car drives, then that's an Eclipse.