I did charter with Ecker in 2011. I would do so again. We did a two week one way charter from Dubrovnik to Trogir, and started our charter on a Wednesday. That's one of the attractions of this company. Chartering Wednesday to Wednesday is a lot more relaxing than Saturday to Saturday. Ecker is one of the few that offers this.
The boat was excellent. We even were send the boat manual in advance, so knew what was on board. Guides and maps were on board too. However as common in Croatia
the guide was in German. That is not a problem for us, but if it is for you bring one yourself.
We managed to lose a fender
, and break a few things in the galley
, but were not charged for that.
I have also chartered with other companies in Croatia, and those others were invariably always competent, reliable and honest.