The magnetic battery cover is great, makes changing batteries a breeze. Unfortunatley, its not upgradable like the IPV3 due to the lack of the usb port. Sturdy construction. Comes with a rubber cover which is a plus. I like the screen on the Sigelei a bit better than the IPV3 but thats my own opinion. Spring loaded 510. There are some complaints of the fire button getting stuck in the firing position but I have yet to experience that, I just make sure I put in lock mode or even turn the device off before I put it in my pocket. Just learned of the locking feature in another post from another member. I daily it with an Orchid V2 but have a Darkhorse I fool around with occasionally. Simply put, I love the device and highly reccommend it.