Hi, I've got a question on a walk behind string trimmer I just bought. Out behind my barn I've got basically a jungle. To help with this along the fence lines I bought a Gravely walk behind string trimmer. My initial experience wasn't that great, I went through 4 sets of .150 string in about 1/2 hour of cutting. Went out and bought the only line that Tractor Supply had near that size, some Swisher .155 square line. This cuts and lasts FAR better than the factory round, soft stuff but I'm wondering if there's something even better than the Swisher stuff. It's kinda pricey at $12 for 36 pieces. (18" long) Does anyone have any suggestions? I'd appreciate it becuase I've still got alot of trimming to do.