I have a Viking 905...I don't think they make them anymore.....but this one is a work horse.....just the basic 4 thread serger...it does have a free arm (can remove a part), a differential knob ...which comes in handy and is manually threaded...which is a bit of a pain but do-able. I would recommend practicing the threading several times when you first get it...yep...thread it..unthread thread it, unthread it....until you are sick and tired and can do it in your sleep...well worth the torture tee hee....anyway..there is no digital screen on my serger...It works just fine for me...things I use it for are hemming my jeans...just mark the length...measure about one inch longer and then serge there...makes a nice finish on the seam....then I just fold up that serged edge and straight stitch my seam...it also works very well on stretchy material....I have used to make fleece blankets and to serge fabric before washing to prevent raveling....I don't use it all that often....but...it works great to finish seams for bags too....I bought a bunch of colored serger thread which I honestly have not used much of ...as I use mainly white, cream, grey and black.....this serger will last for a long time because of the lack of high end computerized stuff...now if you want to do fancy serging...this machine would not be it as it has no cover stitch....