I have a custom restricted that I got on sale and didn't have money to buy ESTs so I used my Forum Factions. They worked fine but it got to be a pain to check the screws before I rode because they covered up by the foot bed. Other than that it was all good. I ended up buying Cartels and the Malavitas for it.
I noticed a difference in feel when riding with EST's the first couple times, but I don't seem to anymore so the enhanced feel may have just been in my head or I got used to it. I'd keep the ESTs if money is not an issue, they are nice to have and feel great. But if you don't want to spend the money I'd return them and just use your old ones.