What the manufacturer says:
C. Wilson (4/10/14)
One if my favorite sets on the market. They ring like bells and are insanely cheerful. I would recommend these strings to anyone with a softspot for a cheerful sound.
R. McDonnell (3/30/14)
Tonicas are Pirastro's third, and most popular attempt at creating a rival string to the Thomastik Dominant. Like dominant, they feature a nylon core. In my experience, they are not quite as good as dominants. On my violin, a neutral to bright instrument with good projection, they are pretty quiet. They do not ring at all for me. The response is poor with these strings on my violin. That being said, I know plenty of professionals who use these strings and they are excellent. If they work for your violin, they may be the best deal out. If your instrument seems to like neutral synthetics like dominants, these are definitely worth a try.
J. Penurious (11/13/13)
These strings are quite nice. They allowed me to feel like I was getting away with something. They respond beautifully to various bowing manipulations. I would recommend trying them, but like any string, they sound different on different instruments. That said, you'll like them if they sound right, right after you put them on.
S. Thompson (5/14/13)
I started on these strings, but then put them aside for something with a bit more punch. Their 'new formula' is fantastic. It is nothing very different, but has that punch I was looking for. These are comparable to Dominants, and only seem to be down played because of the price. If you like Dominants I would highly recommend picking a set of these up.
T. Truong (5/7/13)
After trying these violin strings two years ago, I'm still a devout follower. They are extremely durable and quick to settle. Quality is comparable to that of Dominant strings but for a cheaper cost. I recommended it to all my students and these strings seem to work wonder for them.