Don't have the Nautilus, but I have most of Aspires other glass lines. Davide BDC glass, Vivi Nova BDC glass, ET-S BDC glass, and they are all top top notched vapes.
The downside is having to buy the pricey heads, and some of those heads are defective out of the gate, so you spend a lot of money on heads. But the vape quality rivals anything you can build or buy I'd think. I just don't want to spend $2.50 to $5 a day on heads.
This is ONLY a problem if you are vaping DIY or very atomizer gunky juices. Since I'm still all over the place on juices, when I realized that I was going through 3-5 $2 heads a day, I stopped using them for a while. I spent up to $10 a day in heads playing with gunky juices. Doh.
If you vape reasonably clean juices, I've read that some people use 1 head for 2 weeks, so hands down the BDC heads are fantastic

.