I'm ready to buy either the Stihl KM110R Kombi System or the FS110R trimmer/FC110 edger primarily for the benefit of being able to buy multiple tools for one powerhead. However, I can't decide which one would be best for moderate weekly use and changing of the attachments 2 to 4 times per week. I will use the straight shaft edger attachment 80% of the time. Positives for the KM110R are the ease of changing the attachments and available extension for the pole saw/hedge trimmer attachments. The major positive for the FS110R or FC110 units seems to be the solid drive shaft, which should transfer more engine torque and be more durable. However, I'm concerned about how much trouble changing out the gearbox attachments is vs. the Kombi split boom and if constant changing of the gearbox attachments over time will wear our the attachment head or strip the allen screws. I'm leaning toward the KM110R Kombi System but the flex cable drive has me worried in regards to durability and strength. I've read all the posts on this subject but would welcome any posts shedding more light on the solid shaft vs. flex cable question and any problems concerning changing out the gearbox attachments (which my Stihl dealer says are the same ones as the Kombi System shaft attachments). Thanks!!!