Yes, they are popular on WindowsDeal.com. Though they rarely state that on offer page. I guess it's still better than nothing.
Bitdefender is the bdcore scanner only but the plugins are the full set, approx 900 or so sigs, with update checks every two hours. For Emsisoft it's not just their a2engine, but 32 and 64 bit components for their behavior blocker (yes, THAT behavior blocker), malware IDS, trust library and cleaning driver. Sigs also updated regularly, including the malicious URL data.