I have used their services for more than 4 years now, they are always willing to help me out with any queries or problems that i may face during my work day. The support is excellent at all times of day, whether it be in working hours (for UK) or after business hours as well.
They also provide other products such as CRM software which can really add value if you require some additional functionality. Nothing much but everything works perfectly! We use them mainly to manage our contact dataβ¦