The ease at which I can add my own images or use stock photos with this tool! It's very easy using their drag & drop feature. You're able also upload your logo in place where it says 'logo' - so no need even worry about uploading one yourself if you don't want too ;) Also there are many templates available as well (I've been trying out some different ones) but they seem not be updated regularly though :) Try them first before purchasing anything else because it does get pricey depending upon what features do you require etc! Adding graphics / logos into our emails has never really worked smoothly until now when we got mailerslite installed!! We have used other providers previously who were quite expensive compared to others like usernetwork solutions provider.