I like that this tool allows me access all domains available in their database even those not currently under contract with another registrar (eNom).
It also provides an amazing list of additional metrics including WHOIS info as well! The interface could be made neater but overall great service from start-up up until now they have never let us down once we've purchased something through them - always professional & quick responses when needed!! We are using DS at present so no problems yet however if there were any issues would certainly report back via email/phone call etc which gets dealt quickly by team members too. Excellent customer support / response time / turnaround times compared other services out online or offline where our previous agency was just averagely good.