I like how easy it was to set up our policies with this product! It has helped us keep spam away from my office's inboxes by letting me know when there are issues we need to address so they don't get through later.
We still have some things left open but those will be addressed soon enough :) If you want something quick & dirty then check them out - if not try one of the other products/services available (like google) first before jumping into another service because your needs may change over time as well. They do offer discounts though which makes sense since they're trying to sell subscriptions instead of just giving access via trial periods. So far everything seems good about these guys' business practices too.