I like that it is easy to use, has no contracts or monthly fees (except for Pro plan). The fact you can have more than one account with them makes sense as well! You really cant go wrong here if your looking into this service at all - its cheap in comparison other options out there too so thats great!! Free version does not allow any kind of analytics/data collection which could be helpful when trying new features without having spend money upfront first otherwise we wouldnt know what works best for us until after paying some cash :) Have fun building up campaigns etc using free option before upgrading once funds are available! Sending automated emails via our own domain names / IP addresses instead from their servers saves time & cost compared wth others who charge per sendings through theirs rather then ours.