Mmc... I've had a couple sets for three weeks now and I thought I'd have an issue with the larger diameter, but to tell the truth it only took a couple sessions to not even notice it.
However, I saw in the eGo-T vs Go-Go thread in general where some people have used eGo-T whistle tips slightly modified or even cigar tips. I'm sure as the Go-Go catches on there will be more options including drip tips.
On another note... the same thread has many reviews of the Go-Go. I'm very happy with mine. I top off three cartos every morning and charge a battery every other day and I'm good to go all day. It really is the easiest, less time consuming vape I've tried.
Good luck!