I've had different mods throughout the years, but have always stuck with my baby beast tank as it's always worked fine and never leaked for me. However, the last few months I've had a nightmare with the Smok coils as they either won't screw into the tank, or it leaks all the time. So I randomly decided to pick up a Vaporesso Xros 4 from a local shop out of frustration (after buying disposables for a month) and I have to admit, I'm glad I did.
It's definitely more convenient when I'm out of the house as I no longer need to bring a backpack with me to put in the multiple batteries, a pack of coils (because I never know which coil will screw in until I need to change the coil) and a lot of kitchen roll ready for when the tank leaks.
My only issue with the device is the battery life, as I'm used to having multiple spare batteries with me at all times for my old device, so I never had to consider how much of my day is currently spent vaping. Whereas I currently am having to charge this device multiple times a day (5+ times) due to me currently being out of work. So I'll be picking up a second Xros 4 next week so I can have both on rotation, however I'll probably find one is more than enough when I start the new job at the start of August.
Even if your happy with your current device, I'd certainly recommend picking up an Xros 4 or similar device for when your out and about and want to save on pocket space.