We have been using control S for more than 5 years now without any problem! Great customer service team as well great support when needed to be solved fastly - even 24/7 if it's urgent!! Nothing so far except that they are not available in all countries (Italy) but I'm sure this will change soon with their new datacenter expansion plan.
Highly recommended by us because of its reliability since we need our servers up at least 99% time during business hours or else no revenue generated! No downtime ever seen yet from them either :). Their prices aren't always cheapest compared against others providers out there however you can get good discounts especially via webmasters network which gives nice rewards after some sales made through your website promotion link given :) Also check how many customers actually use each version before deciding what one fits best into current situation / needs etc..