I am zero for 2 with the Hill EC-3000, unfortunately.
My first one was purchased a couple of years ago, when they were pretty new to the U.S. market and still listed just under $1,000. It only worked for a couple of hours before it wouldn't pressurize past about 100 bar. I've heard others which did this and it was a fairly easy fix, but for $1,000 and so little use time I returned it for refund within PA's return window. It just didn't give me confidence even though Hill is a well respected pump maker.
Recently I purchased a second one, to see if the Hills had gotten any better. This second one read a dangerous 30-40 bar LOW against some known good gun gauges (Red Wolf). So my 250 bar fill with the Hill would actually have charged the gun to 280 bar +. I also noticed that this second unit could not complete the topping off of a 480 cc tank from maybe 180 to 240 bar without stopping to cool at least once. My original EC-3000 from 2 years ago could have performed such a top-off without needing to stop and cool.
So maybe this second one had some issues from the very start? Anyway, being 0 for 2 I have lost confidence in the EC-3000. I had hoped that Hill had gotten their act together a little better in the couple of years since this compressor was launched, but in my experience they have not (or I'm just really unlucky).
If I was going to spend the money being asked for the Hill, I would probably pop for the Omega Air Charger for just a little bit more. AoA currently shoiws them in stock. While not the same for everyone, my experience with the Omegas so far has been flawless. But a couple of things to remember with the Omega pumps are: They thrive on frequent use, but their o-rings can flatten out if the pump is not used at least once every 2 weeks or so. And DON'T turn the grease pots more often than the instructions and/or service light specify. More is not always better.
My understanding from an Omega pump service guy is that flattened o-rings from lack of regular use and too much grease in the internal workings are the most common issues in their pumps which are returned for service.