I don't follow any consumer product brands (which is where I assume most of the ads will be from). I use Twitter to follow news sources and nonprofits--which is a lot of the content I post in return--so this doesn't affect me. But I tweet for a small nonprofit, so I'll be keeping an eye out to see if it'll be worth it for us to do a promoted tweet; same as what I'm doing with Facebook ads
Twitter ads are coming to Twitter timelines: Will that affect Google+ usage at all?

I originally thought it might drive people over to (ad-free) G+, but now the reports are that the promoted tweets are only from brands you already follow -- so it's just making something you already subscribe to more visible.

That's a lot more tolerable than I'd previously imagined.

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