Pros:
1. It does what it's supposed to do.
2. It does extra - allows you to check accounts if they're still alive.
3. It is very affordable. I know of another good bot which even though it is more powerful it alsa costs a lot more.
4. Supports both public and private proxies and you can select which ones you want to use.
Cons:
1. Unusable with public proxies. This is not really the fault of the software though but just a fact you need to take into account. There's nothing wrong with the software it is just that most public proxies are used by many people to register accounts on hotmail and because of that they are already blocked by the time you get to use them. For those who don't know, hotmail allows only 5 accounts/IP/day.
2. No multithreading. That means it is not super fast. On the other hand if it would have multithreading it would probably cost 5 times more. So I think overall it has a very good price/features ratio.
Bottom line:
1. If you need only 20-100 accounts/day you can probably manage that much with public proxies. Maybe even more if you have proxy sources that are not known by many people.
3. You are limited in the number of accounts you can make by the number of private proxies you have. Realistically you can probably do 3500-4500 accounts/day if you have the required number of proxies (700-900 proxies).
4. If you need more accounts and have the money to pay for more than 700-900 proxies then you can either buy 2 or more licenses for this program and run several copies or you can buy a multithreaded solution that is about 8-10 times more expensive. I don't know how many people can afford more than 900 private proxies to make that worth it.
For $15 I think this is a no brainier.
To the guy asking how much it takes to use up 500 proxies. This is how you can estimate time per account and then multiply by 500.
Time/request: 5 seconds avg.
Number of requests: 3
Time/captcha solve: 15 seconds avg.
---
Total time/account 5*3 + 15 = 30 seconds.
So for your 500 proxies you would have somewhere around 500*30 = 15000 seconds = 4 hours
That is assuming all proxies are private and you have no dropped requests.
It can be a lot less or a lot more depending on your internet connection speed and how fast the folks that solve captchas fill in the answer.