Aweber's great and used by so many in the industry. Go for it - you'll be hard pushed to find a better solution at the price
I host my own autoresponder with a double opt in feature. Its a lot cheaper with no restrictions. There are lots of 'open source' i.e free autoresponders available if you want to host your own
It is best to use Aweber and build your own list instead of bringing direct traffic to those premade affiliate marketing pages with their own autoresponder forms and building the companies' own list rather than our own list. Wish You Success, Edwin Maglipon