I've been running with a pair of Yamaha HS80M monitors for a while now and really like them. However I have them on one of those glass top desks from the local office store and anything on the desk rattles, along with my drop ceiling (in my basement). I had smaller version of these speakers with and 11 Rack setup and then upgraded to the HS80s after getting my profiler almost 2 years ago.
Just before Christmas I treated myself to some IsoAcoustics monitor stands and Yamaha's HS10W subwoofer the matches the HS80M monitors. I know that many will say that running a subwoofer really isn't necessary with the HS80M monitors but I have to tell you that I would easily recommend it. These monitors are very revealing and are made for mixing. I don't really record much other than for my own hobbyist kicks but I bought them at the local Guitar Center after auditioning them and chose them because they sounded way more open to my ears than anything else. I think many people in the know would say that they are very revealing and flat but I also know that a monitor that has a little more hyped low end, such as a KRK might actually be preferable to some ears - especially if you are just going to use them to play your Kemper through. Now with the sub added I feel like I have a much fuller sound that reveals more that I was missing. In moving from being use to the "amp in the room" tone for years, I think having the added sub would make for a much less steep of a drop in transitioning (and no... I'm not saying I have an "amp in the room" tone now - just saying that having the sub makes the sound in the room more robust and a plus for any style rig I run through the Kemper). Obviously my more rocking rigs sound much better now but I have to tell you that all those great Amp Factory profiles in the clean/clean+/cranked settings get equal benefit - they sound really great now. I could get more woof by playing the monitors louder on their own but, for me, not having to play the monitors extra loud just to feel more "body" in my sound makes for a better experience. The Kemper sounds "better" with the sub - YMMV.
After putting my monitors on the Iso Acoustic stands my first impression was sort of... meh. After a few hours (and now a few days later) with them however, they clearly are a plus for me. Now, let me preface this by saying that adding the sub led me to changing the settings of the monitors (cutting some bass from them) but I still believe that I'm no longer getting the vibrating ceiling tiles at all because of these stands (I've pushed the volume to test it out a few times). The stands come with long and short rods to give you two height options. I'm using them in the tall setting but have the speakers on their sides (yeah I know - may cause phase issues - but it sounds fine to me) so that they tweeters are now near ear level but. I'm not too worried about mixing and I'm actually am often sitting on a couch across the room so that added height just helps the whole situation of listing to "near field" speakers from a not-so-near listening position. To the purpose of the stands however... they aren't going to perform a miracle but they work as advertised/as others have reviewed, tightening lows and mids and they certainly helped my non-ideal situation (untreated room, using near fields often from about 15ft away).
Obviously I have a combination of changes at play, and I really had no intentions of typing about either additions on an internet forum but just wanted to share my non-scientific findings and give both the sub and the stands a thumbs up to help anyone else considering either of these.
Hope this helps someone.
Patrick