I agree with Cskent on the upgrade, but the 4081 is nice to have for a few reasons:
1. Loaning out to friends who are teetering on the edge of getting into vaping. Sure, it has its limitations, and as long as you explain that going in, it usually has a favorable result. I've converted two of my friends this way.
2. It's nice to have as a backup or quick on-the-go vaping. It is about as basic as it gets, and sometimes there's something to be said for that.
3. Parts are relatively cheap for them. I managed to pick up a 5-pack of batteries in the Totally Wicked Yo-yo sale for about $20, but even at $35 for the 5-pack, it isn't bad.
Contrary to what a lot of people say, I've found my 4081 to be a decent little unit if used properly. By no means is it an all-day vape, but it CAN get the job done.