Im running 4 and like it better then 3. I ran 3 for years and 4 is smoother and more user friendly. IMO it was well worth the little it costs. I tried to use flexi again since I got a new Graphtec and felt clumsy and didnt seem to be as user friendly. I tried the Cutmaster 3 that came with cutter and it was smooth, but limiting. So back using SCALP 4..044 and 0 issues.