What I like the best is that their support was pretty helpful. They were ready to discuss all my concerns and leaded me during all intergration period.
It also was the only company, that was actually intersted in me as a client. At least this is the way i felt. I used to work with Vasco for about a year, before our company decided to switch 2FA provider. And I felt like they did not want to assist me at all, when I called. I always heard only 'You can check it on our site yourself' and bla-bla. So this company(Protectimus) was very fresh and enjoiable expereince for me.
They also have this pretty useful feature: you may have two(or even more) security levels for different groups of users. For example, for administrators and average employee.
I never thought about it, but it actually is pretty convenient. You don`t have to block account if any employee just entered OTP incorrectly several times. But if someone would try to get access to account of the top-management representatives, it surely is useful to block account immediately.
Maybe I have some concerns since the company is not such a huge player on the market. Till now it have not affected my work with them, but still it`s not a Vasco or RSA, you know.
If you are looking for solution easy-to-use and easy-to-integrate 2 factor authentication solution then go ahead.
So as a summary:
Good support, reasonable priсes, easy integration.