What do you dislike about Wufoo?
Our nonprofit has used Wufoo for 14 years. We are no longer going to use them. They are a nightmare. Wufoo does not have a way to prevent spam submissions. On payment-integrated forms this is critical. 
For example: yesterday we had over 35,000 spam credit card transactions/submissions in an 8-hour span. It 's a nightmare. Wufoo does not use CAPTCHA. Their support is a joke. The only option they give is to limit forms to one submission per IP (our donate forms are used by the same users repeatedly). Or require a password (not an option for us). Or have no forms at all. I'm not joking. I can show you the support emails where having no forms was their suggestion to solve the problem. It's insane. 
At first they told me if I required bots to type the word "I'm not a robot," it would stop them. I told support that it would not stop the bots, but I tried it anyway. I was right. It provided no deterrence. 
Then Wufoo told me if I would not host any forms on our site, it would stop the bots. Wrong. We have no forms embedded on our site. All our forms are Wufoo hosted only. Bots are still finding them. Wufoo has no plans to implement CAPTCHA. 
Wufoo's security and spam prevention is akin to a bank asking to keep your cash... while having no vault, no locks on the doors, no security guard, no security cameras, or anything. It's unconscionable that Wufoo would actually take customers' money for this service. Using Wufoo has cost us time, problems with our payment gateway as there are tens of thousands of fraudulent transactions in a 24-hour span... and problems with our email server, as there are 100k emails per day. 
Using Wufoo is now nothing but a nightmare. DO NOT USE WUFOO. There are far better form builders for the same or better cost. Again, STEER CLEAR OF WUFOO. USE ANOTHER FORM BUILDER!! Review collected by and hosted on G2.com.