I'm not so sure. I have a VV mod and my most recent purchase happens to be a VV mod, but I'm still not drinking the VV koolaid. I'm less than convinced it's "worth it" specifically when that's the only feature someone is thinking about when they buy a PV.
After reading the chatter about VV for months, I caved in a few weeks ago and bought a VV device. What I discovered was that I ended up setting it to exactly the same voltages I was able to produce before I had VV. I spent a lot of time, money, and effort over the last couple of years matching my cartos, attys, and juices to my batteries. I found combinations I enjoy and VV didn't make me enjoy them more. There has been no moment when I thought to myself, "Wow. This is so much better than what I was doing before!"
The one point that was made that I'm willing to really give a little credit to is that voltage regulation is nice. Batteries drain as you use them and if unregulated can indeed create a much different experience over the drain curve between being fully charged and needing to be charged. I've been able to mitigate that issue quite a bit by using higher quality batteries and making minor adjustments in my choices of attys and cartos. But, voltage regulation will always provide the most consistent experience.
I think there are other features in PVs that are more important. I also think the features someone might desire vary a lot from person to person. Using myself as an example, my work and play involve a lot of rough physical activity and often unpredictable circumstances. The very first thing I look for in a PV now is durable construction. I've owned a quite a few plastic boxes because they were easy and inexpensive. I learned that ten or a dozen broken plastic boxes could have been completely avoided with one good metal tube or metal box and I would have saved money in the long run had I considered that to begin with. My work days can be anywhere from 10 to 20 hours. That often means I won't be near my supplies for extended periods of time so I need to carry enough stuff to last until I can re-supply. Had I considered that to begin with, I probably would have started leaning towards feeders a lot sooner. My social situations are varied, too. Some devices just aren't suited to match some of the people I'll be around or places I'll be. I have to travel occasionally and I've discovered that some devices are scrutinized far more seriously than others by airport security.... etc etc etc.
VV is just one feature of many available in PVs. Maybe you need something small - maybe you want something that looks cool - maybe you like a specific color or build material - maybe you need a drip well - etc etc etc. There is a lot to consider before you decide if VV is "worth it".
