I was using my vivi novas for "juice testing" at first because it was all I had, but found my personal preference led me to a couple cheap 510 atomizer that I debridged by following some youtube videos lol. Without all the extra junk in there its basically a little cup with a coil, drip 2 drops, give it about 4 puffs and switch. You might get one puff of the next juice that bleeds some flavor over then its full flavor of the new juice.
Yes they don't last forever, and yes I see a RBA in my future like a phoenix or an A7, but it does the job for now.
Good luck!
I agree, I'm new to vaping(1 month) and use a rotation of 3 V3 clearomizers for tested flavors. For testing new flavors I use a bridgeless atomizer that cost $6.00, it's easy to use, no flavor carry over and if it lasts a month I'm a happy camper.