I know their not glamorous, put the Yorkville YSM1p somewhat fall into the NS-10 rang for me. I mix on both all the time and have come to appreciate the Yorkies ability to translate as I appreciate the NS-10 to bring some reality to the Genelecs (which I am not particularly fond of but are standard at a couple of my main gigs.)
You don't have to tape a piece of one layer tissue over the yorkies and they don't make you work quite as hard (the brilliance of NS-10s), but they are accomplishing a relatively similar outcome for me. I use the yorkies for my little writing studio. By little I mean to say that I am using great conversion, API 3124 pres... etc... just to give you an idea of where i am coming from.
I've been in sessions with those... top-shelf producer who used them with a pair of Gens. Does a lot of his own mixing there and the mixes sound amazing. I was not the engineer on those sessions so that's all I know.
I have a pair of MSP5. I am not sure the model is manufactured anymore after the HS80 came out.
It is a nice little speaker, a little larger than the small Genelecs. Decent sound and decent volume. One annoying thing is that the bass ports create a quite strong directional wind, it literally puffs in your face.
Can definitely be used for mixing, they tell more or less a true story. In that price class they are not bad really especially as they seem to go quite cheap on the used market. Of course there are better speakers, generally both larger and more expensive, but as things goes these are acceptable.