Mouse said
I purchased the Holstein Freedom Violin Chinrest, with viola barrels so that I could use it on my violas.

These look like a slimmed down Guarneri. I am not fond of Guarneri style chi rests and immediately change them out if they are on an instrument I get.

I decided to give this. shot because I have changed how I hold my instruments. I am trying not to face the fingerboard and watch the strings as much. I want to look more at the music, than my fingers. This looked different than others I have tried and decided to give it a try.

Holstein Freedom Chinrest

The first thing that I noticed was the my instruments opened right up. The sound projects more and is more clear. I am thinking that it is because it is very lightweight and there is not much to it? @Fiddlerman, can you confirm that as the reason my sound from both my 15 1/2" Fiddlerman Soloist Viola and my other viola that is 15 3/4" is more clear and seems to project more? 

The instruments are also lighter on my shoulder.

Now, for the chinrest. I really, I mean, really love this chinrest. Again, I am very surprised. It is so comfortable. It gives just exactly the amount of grip I need. It does not cut into my jaw. notice, in the picture, the part of the tailpiece is flat and narrow. Perfecto! It is allowing me to hold my instruments the way I want to hold them. 

I will be getting these for my violins in the near future. I just want to make sure there isn't something else I need before I place the order. 

For the record, the viola is a 15 1/2" Fiddlerman Soloist in Amber. It is beautiful and sounds lovely.

  

This chinrest is by far the best one that I've used. My playing has improved because of the comfortable hold and posture that I now have. It also made the sound a lot better since it is more lightweight than the traditional chinrests. I love it so much. Cheers from the Philippines!