PS: Forth way which is actually quite effective is to offer non-trial, but limited functionality product. Carefully think about limitation - the approach that w

PS: Forth way which is actually quite effective is to offer non-trial, but limited functionality product. Carefully think about limitation - the approach that works best is something that allows customer to use all features of product right away but limitation gradually gets annoying to stimulate conversion to paid user. Example: more data come in and non-paid version has limits, or more sub-users signed up but non-paid version has limit of 5 users. Quite often after offering this along the 30 days unconditional refund version will do the trick.