I agree with all the good stuff that's been said about the BCS, but I have to caution that (like all other machines) they are not 100% bulletproof.
I have a BCS 850 and a number of attachments. One of these days, I'll get around to reviewing them individually on this site. For now, I'll just share an embarrassing tale about my use of the 26" brushcutter.
Last year, when in a hurry to get a bunch of brush cut, the machine started vibrating quite a bit. I thought to myself, "Must be a blade a bit off balance," and fought the vibrations for the next two hours or so in order to finish the job.
It turns out that I had hit a rock or something that caused all the gear oil in the brushcutter gearbox to leak out!!!
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Needless to say, by operating it without gear oil for 2+ hours, I have undoubtedly tore up the bearings, and maybe the gearbox itself.
Since I also have a sicklebar and finish mower attachments (plus tiller, rotary plow, etc.), I have just parked the brushcutter since that gruesome mistake. But one of these days, I'll open it up, and see what parts i need, and order them from Earthtools, and git-r-done.
If you have the $$$, the BCS is hard to beat in a small power unit. Just be sure to check those seals and oil levels!!!
-otus