Inline is a small operation. When I say small I mean every machine is hand assembled on a workbench by a single person. The builder is a full time artist as well with a family so e patient and you won't be dissappointed when your machine comes in. I use my 4.0 for everything and love it. I run it around 9 volts for lining give or take. Just got another 3.6 for bng and love it