I have a question, hoping some one can answer me. I will be buying a k40 in the next few weeks in Australia. Tired of my 5 watt led. I see 2 versions on ebay here so far. 1 that has an old style mili amp needle meter (Looks like the unit shown on this site) and another that has a digital one. Both about the same price. Any suggestions on which unit is better and I don’t mean the mili amp meter itself. The one with the needle has a rotary dial for amperage adjustment and only a couple of other switches. The digital one has press bubble buttons by the look of it for adjustment. I would probably prefer the rotary dial one with the needle more old school and less issues. SO any comments on either of these.