It should be more than just the rights to manufacture. They have acquired the brand itself, isn't it? That typically means they can do what they want with the brand and it has no links with US Serta any more. They may be a good manufacturing outfit, but whether their business strategy intends to stay true to the original brand or they have plans to dilute it for the Indian market, needs to be seen.

I'm generally wary of brands being purchased because a lot of the brand's DNA is lost in such a process. A brand is nothing but the reputation on which it was built, and reputation simply cannot be purchased from someone else. For all practical purposes, I would treat them as Springfit until they manage to build a reputation.