I just got an Expobar Office Lever Plus, these are my first impressions.
First I drained the water tank in one day... the E61 head does use a lot of water, I'm glad I got one that can be plumbed.
I bought fresh beans from a local roaster... some congo, brazilian, and two blends. Theoretically all roasted within a week or so.
Weighed out 18 grams of beans(in a not so accurate kitchen scale) and ground them in my... ehem... ROK grinder. Now I know I was advised against this grinder but good reviews online and the assurance from WLL that the design is improved and pushing the budget for the machine thinking the machine should live a long life. If I could make the ROK work that would have held us over until a new grinder comes along, but my first pulls were running through in 15-20 seconds to 2 oz. So I tightened it down as tight as it goes... It can still turn with resistance but I wouldn't say they are locked together. I got a 25 second pull tamping the crap out of it(with the plastic euro curve Expobar unit) and grinding as tight as it can go... but still not great crema production, it was there, but not silky and creamy just a thin layer up top.
Hard to get temp measurements as I don't have a way into the head yet, but in the cup it was about 160 ish with a good thermopen reading. (HX machine)Boiler pressure is around 1 bar I haven't honestly caught the brew pressure as I have been looking at the stream. I flushed each time before the shots for a few seconds, only once did it seem overheated and steamed a bit.
I can tell a difference in the two coffees I have tried, the Sumatran/Colombian blend and the Brazilian Serra Negra, But nothing really complex about them, No layers, no lemony citrus acidity. Just strong coffee and a bit bitter(she had to add some sugar to the Brazilian). The stream didn't really change much through the pull so I've been measuring to 2oz in the cup.
I am guessing I'm not getting the grind I need out of the ROK, and as its bottomed out, I don't know if I can get more out of it... No chance at choking the machine. My scale probably sucks as it seems its plus or minus 2-4 grams. the tamper is the kit one. And may need an erics style thermometer to know anything about the group head.