Not really answering your question.
I have just gone through the process of trying to decide which mill to get. I decided against Warco WM16/18 and Chester Champion 20v due to lack of stock and not being able to find any information about how well they perform.
The reports of after sales support for Warco and Chester seem to be mixed where as ARC has very positive comments. Plus Ketan posts here and comes across as honest and straight talking.
My short list came down to the SX2.7L and SX3. What really sold me on the SX2.7 was JasonB's videos on youtube (search in youtube for mrjasonsb) He has put up some videos to support the MEW article Milling for beginners, also has done a couple where he has pushed the mill. Being able to see and hear it working really removed my fears about buying a lemon.
I was all ready to place the SX2.7L order when my wife convinced me to spend the extra £300 to get the SX3.
Adrian