We've played around with it a bit when considering if we were going to offer it or not to clients. For the money it's not bad. No it won't compete with WHMCS or some others but it's almost a 3rd of the price so it shouldn't be expected to. For what it is, it works. For a reseller or new host just starting out it may be all you need. The only issue is if you decide on a more robust system down the line like WHMCS, then the migration may be more of a headache than it's worth to save some money at the start.