I "Stihl" only own "STIHL" ….. have about 20 of there products Stihl ….. LOL ….
From the oldest being an 050AV, 051AV, 088AV, 045AV Super, 056AV Magnum, (2)031AV Quik-stops, 038 Super, 038 Magnum, (2) 066 Magnums, 020AV Super, 015, MS230, SH55, BGE61, FS120 (with weed eater head and brush cutting blades), KM90R (with pole saw +extension, weed-eater head, power paddle broom) and also an 18" Electric Chain Saw ………….
All of the above "STIHL" running Great …… the 050 & 051's if they could only tell stories !!! ….. I've cut Thousands of board feet of lumber (Alaskan Mill attachment & Alaskan Mini-mill), I built a Double ended 60" Bar and put both power Heads on the same bar of the Milling Attachment, (I later acquired the 088 Magnum and put it onto the same Bar using the Helper Handle on the other end) ….. Cut Hundreds of Cords of Fire wood with them, we cut Thousands of ton's of Ice Blocks out of the Lake with the 050 & 051's (over 20 yrs when the Lake, at times the ice was 39" thick and had a 42" bar) because of the power head design they were the only saws that would take the sometimes sudden Rush of Freezing cold water with out mucking up the Air-filter system or drowning them thru the intake, we put the blocks up into an ice house packing them in damp Saw dust over the Summer selling them to the Tourists to keep the Beer cold in their coolers at the Fishing Resort we owned …These 2 power Heads have NEVER been rebuilt either !!! …… used to build Log Homes back in the '70s & early '80s with the 031's, 045 &56's, and then the 038's ….
STIHL sells more Chain Saws World Wide than the other top "5" brands combined !!! ……… cheers