Tbh mate they are all pretty much of a muchness imo. I had a standalone Jebao DP4 before this which was great. Never missed a beat, dosed accurately once calibrated, easy to program and best of all was £70 new. If I was getting a standalone doser I wouldn't waste my money on an expensive one. I only got the GHL so I could control it from my laptop.
The chinese are making some very good copies. Marine color copied the Kamoer design. Jebao copied the GHL design. I wouldn't be surprised if they were built in the same factory truth be told.
That said, I do like the shiny things in life. The Kore 5th doser looks immense! I wonder if I could sneek it past the mrs?!