Darco Strings / Martin Electric Standards

I'm on a search for decent electric strings, in large quantities (to save money). and I've stumbled upon a store selling, "These are the strings that Martin sells to guitar dealers for restringing purposes. They are the equivalent of Martin Standard Strings (not flimsy like Darcos)."

Not sure if anyone knows what this means. I can't say myself because I'm not too knowledgeable in the string biz :P
If anyone cares to share, please, be my guest and enlighten me!

However, I've never played on Darcos. Are they really that bad? What experience have you had with Darcos?
Or these "for retail restringing" packs (electric only)?

Cheers.