Some folks are fortunate to have lots of real-estate for dispersed antenna farms that don't impinge on others' modern devices. Particularly for those in a suburban environment embarking on HF, even just getting an antenna up can be a chore - not selecting one but even the simple mechanics of getting the dang thing up in the air. No such luck here, my 80m dipole runs along one side of the house, typical small-town residential lot. It works great thus far; wish I had the room to duplicate it oriented 90° differently.
Not everyone may be in a similar situation but, if you are, it can be frustrating. Awhile back I embarked on a mission to lower my local noise floor just as much as possible. I'd already applied the ginormous RF choke to the AC line coming out of my wife's O2 machine to help with no RF in the house, especially since I am blessed with a very robust safety ground system - the last thing I want to do is pollute the house wiring. I also located any power supplies that were making noise via the handy old-school portable AM radio, made sure unnecessary wall-warts weren't plugged in, located a flourescent ballast that was headed south, allowed the twist in twisted pair to help out the wireless router, and choked the living **** out of the cheap cable modem from the CATV company. (It is a fact of life that, generally, most consumer-grade electronics are made with MUCH less adherence to specs and/or consideration for spectral interference. The up-side is that as a ham, if you're running run of the mill consumer gear with good station practices, you're on the moral high-ground when it comes time to mitigate a "neighborly" issue.)
I'd already put a Type-31 choke on the RG-6 line for the CATV which got rid of a few wavy lines on the TV when I keyed down with 100w on a very specific 20m freq. But as I was moving eventually to an amplifier in the station, what works at 100w may not work at 1000 & I was determined not to be knocking out someone's dish, opening their garage door, or killing the internet or CATV.
When I picked up the amp, the kind gent parting with it threw in a low-pass filter as part of the deal because he now belonged to that part of the landed gentry in my first sentence & no longer needed it.
The Bencher YA-1 is too simple. There are alot of low-pass filters that get rid of just the kind of offending harmonics that cause these residential RF nuisances, but not many of them work with serious power going through the device - like a kilowatt. This one does. Frankly, it looks like it was made in the same basic case as my DL-1500 air-cooled dummy load. There are no in/out on the connections, it's just inserted between your antenna and your final RF output. If you have a tuner, then insert it between your output and the tuner. What comes out onto the antenna will be that much cleaner.
A friend who's a manager for one of the 40m nets I frequent hardly uses his amp because he knocks himself (or family) off the internet - so why have the amp? That was not to be me.
Over the course of a weekend I went, from 80m to 10m, hammer down with as much power as the amp would safely tune for that band. The internet was up & running, I was sure the neighbors were watching a critical (not to me) basketball game, the wife was watching a favorite show and I had a live-streaming weather radar image going 3-ft away from the amp next to me. From 500 on 10m to the full gallon on 40 and 80.
Nothing. Nada. Nyet. Zip. I even came downstairs & the bride asked "did you get to check your amp yet?"
So if you are looking to mitigate some annoyances because your emanations are offending some of the consumer krap that's out there, spend the $80-90 and get the Bencher. There are other good reviews out there, and I'm just a sample of n=1, advice on the internet being worth what you paid for it. This will NOT fix situations where you are simply frying something with RF - hopefully not you, either. But if you need something that will strip out the harmonics from a ham frequency that is bothering these stupid boxes - because they weren't designed right to begin with - this could be just the ticket. Knowing this now, if I'd borrowed it & returned it I'd still be running out to get one. Truly, pay once, cry once.
Hope this helps at least one person keep some hair attached to their scalp.
p.s. The "why" of the amp is another tale but suffice that I can do the Seychelles CW on 40 watts but that guy isn't going to be any help if things "get western" as they say. A handful of trusted friends inside a 300-mile NVIS circle will and it can be tough to hold a 75m signal in difficult band conditions - many times barefoot just won't get it done.
73