Registration is free and will remain. Your data will be used solely for the use of ESS and not passed on to third parties. Only if you need more than one account, only for companies where several employees have to work with ESS at the same time, monthly license fees are charged.
I was surprised about the short time needed to go online with our custom solution. Usability is simple and intuitiv. Also the pricing fits quite well to a medium sized company as we are.