I have bought some 34+ JSB Vgo sets in the last 2 months, most of which were distributed to friends and family. Not one of them had a sticky button. I pulled each battery and tested the buttons since I did have an experience with a sticky button on an Xpower (albeit it was originally a 'test unit' and won as a prize with no warranty). Still, that's a lot of JSB Vgos and none have had issues with paint or buttons or charging. I'd say that's a pretty good record.
Joye came out with the "eGo". The size, shape and larger battery size became popular, so many of the other e-cig companies in China started making their own versions, often imitating the original (Riva, etc). It just so happens they have an odd culture on naming over in China, one I don't quite understand. Instead of always making a new name, they cop the already popular name. But this is like saying if Ford created the Model A car, all cars are Model As. Pretty much if it has 4 wheels and a steering wheel it must be a Model A, no matter the maker. The same nomenclature goes for Vgo as many China makers are now calling their higher powered units. Often, you'll see their "ego" and "vgo" are interchangeable names using myriad pictures of styles and types. Though I tend to stay away from those types of distributors, it's not always a guarantee with every reseller.
Just do a search on "ego e-cigarette" and see what shows up. You'll find thousands of links to dozens of e-cigarettes, each slightly different, offering myriad battery sizes and mAh, shapes and connector/fittings. Then ask yourself, "who's is better?". You'll never know until you've tried them all.
Yes, we understand that Joye makes the original eGo. But I'll have to say that when the Model A came out it was a huge success. Same with the Joye eGo. However, would I buy a Model A today to drive back and forth to work, to drop the kids off at school, to do my shopping in, to drive all winter long in 2 feet of snow and ice and rainy days? Probably not unless I was really nostalgic. I would, however, buy the newer "Model A" that came with heated seats, an actual roof, heater, window wipers/washers, rack and pinion steering, a nice modern engine and all the other modern amenities. I'd buy the "Model A" made by someone (maybe) else with all the latest, greatest things in it.