Whether you'll like them is personal preference. But yes you should always adjust any pickup's height to find the sweet spot Thats the only way to judge a pup before deciding to ditch them.
that and having a good amp, you can change pickups all you want but if you are playing through a cheesy toy amp then all pickups are going to sound like crap.
with the Epis I have found that fixing the rat nest wiring harness goes a long way and some time spent adjusting them they are suprisingly decent pickups.
Pickups are personal taste items so it's really hard for someone to give an accurate opinion as to what you should do.
I personally love the Duncan 59's, some people do not............
I am also playing through a 100 watt Marshall stack and occasionally an Egnater Rebel 20 on top of a 4x12 as well. My guitars sound great through them, now if I take it an plug into a different setup it completely changes the character.