I have played with the Buon Vino Super Jet filter for the past few years with my beer. I prefer this filter as I can select the appropriate filter pad - coarse, polishing or sterile. I have experimented with everything from my Belgian Triples to Imperial Stouts. I also recommend Whirfloc and Biofine Clear or similar products. They all work. They drop most of the crud out, without filtering.
So do the filters really work? Yes, and quite well if you select the proper pad density. Do you need it? Only if you have to quickly produce a beer and need to quickly put it on tap. I have found they really do not "strip out" to any significant degree flavor and aroma. I produce only big beers. I find that I prefer to let them sit for several months to properly mature. At the point they become drinkable, then I can transfer from keg to keg and rack off the remaining sediment. Turns out to be less work than filtering, tho not quite as crystal clear, close enough and acceptable. Also less air exposure for oxidation. If I had to rush these beers to public consumption, I would then filter.
Now if I produced IPA's (which I haven't done in 10 years), I might be tempted to filter them just to get them crystal clear and on tap ASAP before the hops fizzle out.