The pricing is good, and as a SaaS, you can change your tier as required. It's pay as you use. If you don't use it, you don't pay. That's a great benefit for us. You can buy plans that range from free to $500 a month. Then, if you want to simulate a stress test, you can see what a single one will cost. It really depends on how you use it. However, you do get everything in a bundle. They don't separate out features into different costs. 

I have used lots of available market tools. I really feel the ease of use, good support of the technology, the fully-cloud-based with almost nil setup costs, and very good pricing of user licenses make this a best bet in the current market.

Mix protocol and real browser based user to save money.