I agree with Oliver.

If your violin sounds too bright or metallic because you are using steel strings, Dominant will help and also make it easier to play in tune. The pitch with steel strings, especially on the G are greatly affected by bow pressure.

If you have old strings on your fiddle changing them will help and if there is potential to sound better Dominant strings might help as well. The problem is that you can never know before trying and they are not cheap.

I use either Dominant or Obligato on my instrument.

Good point Oliver,

No I don't mix them. If I feel flush I buy Obligato. Now a days I think that they are the same price so maybe I'll only buy Obligato from now on.

I actually only use Dominant on the G and D. Use cheaper steel strings on the A and E and can change on a monthly basis

No, sorry, I use a steel core A called "Piranito" made by Pirastro. 

It depends on what your violin likes. I think that Dominant are generally safe and work on more variety of violins than any other string that I can think of. They have been around for a long long time too. You can get a set for under $50. I tend not to use the perlon A-string because they don't last long for me. I can wear one out in a couple of weeks. If you have a very weak sounding fiddle you may want good steel core strings but beware that you may get a metallic and harsh sound.

No one can really say what kind of strings will work best on another violin without trying. Most pros try many different type of strings and learn which work for their particular fiddle. Dominants are used by many pros and even frequently used on fine old Italian fiddles.