No need to pay, we (Twilio) are now actively maintaining it and going to be adding some new features. Common templates exists (not documented) yet. You can put values in URL parameters and the fields will autopopulate effectively giving you URL-based templates. Responses are already saved, click the permalink to get back to them later.

If you have any other feedback items, feel free to post them here or on https://github.com/twilio/hurl and we'll take a look at them. Pull requests are even better.