I don't need to sell Userbrain, the product sells itself. Comprehensive tools, reports and an extensive user test base with screener abilities that lead to fast, insightful feedback with screen and voiceover recordings that are automatically transcribed into presentable results.
A must have for any UX designer! But don't take my word for it, sign up for the free trial, set up your screener and test with short, concise wording and choices, then review the report and screen videos/audio files with transcripts. Like I said, Userbrain sells itself!
Userbrain