I bought/ currently use the 130R (biggest) powerhead ($400), have an extension ($?) and power pruner (~$100, IIRC), brush cutter/ string trimmer combo, hedge trimmer with many angle options, and blower.
Agree with Andy on 'Jack of all trades, master of none."
Not pro-duty, but has treated me well. I do a very limited amount of power pruner work. Its been a help and functioned fine for some canopy raises along a boulevard in a housing area, cutting some dead branches from far away (lower down) in a hecka dying willow removal, occasionally dicing up a low limb rather than rigging it over landscaping, etc. The flip-cap leaks, most likely due to employee error in closing. Not too heavy, not too bad. Definitely made the money back that I've put into it.
The blower has been good overall, with good power. Used it the most. Did have to replace some parts in it, can't remember if it was some bearings or something. Still works well. Much, much better than the BG65 that I have.
String trimmer and brush cutter have gotten some serious work around my property and some other commercial jobs, but I'm by NO means talking the type of work that Stephen is getting out of his dedicated brush cutters. The little gray guide part that is on the end of the attachement where it inserts into the powerhead has stripped. Probably cheap to fix.
Hedge trimmer has been useful and good cutting. I have done a hedge of two with it, and used it to cut large sections of tall grass (reed canary grass 3-4') where the brush cutter would have more problems with it winding around the head and needing to be cleared.
No idea on the cultivator or sweeper.
Its been good overall. Again, not pro-duty. Not employee proof. Had it not been employee-operated, I'm sure it would have held up more.
Its been a good compromise. I have no need for a commercial string trimmer, brush cutter, or hedge trimmer. I'll hope to buy BR600 blowing power.
My engine has been cold-blooded, but always starts, just needing a little warm-up time for 1/2 a minute or so.
Depending on your needs, it could be a good homeowner tool, with some limited commercial application. Not letting employees operate it is best, but I've had them doing it for years, mostly with the blower and secondarily with the brush cutter/ string trimmer and pole saw
The little chest harness is cheap, and enough. A big help to relax the grip and avoid numbness from the vibration.
Agreeing with Andy again---->niche.