Yes, ofcourse. If you are a beginner Marketer and want to take it to the next level.. you HAVE to use some auto responder. Aweber and Getresponse are certainly two of the best. Some people like Aweber, some like Getresponse. My personally, I find Aweber to be a little more manageable for me needs... I've been using them for about a year now, no hiccups, my mail gets delivered fast and reliably. I would give them the Go, for sure.
If you use it for commercial purpose then its worth it coz subscriber will more confident to sign up for the newsletter.