You might want to do a search on the topic.
bassvegas likes them and that's great for
him, but as I remember the overwhelming majority of posters who got samples through the promotion thought the strings were... "underwhelming", to be polite*... especially the low-B on the 5-string sets.
...and the "Free for postage" offer ended February 29th of this year. I believe they're cheaper then your average string on the shelf, but it's for a reason.
(and not being polite? A good amount thought they weren't worth the $3 for s/h. That says something)