I bought a new Stihl FS-90 and have used it several times. I must say that I am a little dispointed with it. It does not spool up as fast or have no where near the power as my Red Max 2610 that has the Strato Charge engine on it. I have several other older pieces of Stihl equipment that have done great for me. Maybe Im just not use to the 4-mix. Anyone else had this problem? I bought the FS-90 because of all the great things that I had herd about it.