Yes , Iam an Alertpay user. Yes they are good company but not as popular as paypal. The use of Alertpay is very limited as most merchants and websites use Paypal.
Alertpay is good, but knows most success because of all paid to click sites moved to them... Without paid to click sites, it would be very unpopular But yeah, I prefer paypal above alertpay
PayPal has more features than AlertPay. AlertPay is still a great payment processor though for things that PayPal doesn't like and is also great for the fees!
Alertpay is pretty good, but needs to be expanded and become feature rich. However, it's a good, reliable and trustable payment processor.