I got the Pro as a one off which is a bit expensive, but John's support is the fastest I've experience out of any WP Plugin. There is definitely a lot of value if you were to get the Developers License. I'm using it as a stand alone Waiting List to create urgency with the count down. There isn't much by the way of landing pages out there, and the $10 ones were so buggy I spent hours trying to manipulate them. Considering they sold the Mail Chimp, etc add-ons separate; this solution works. Go on….Buy it!