The E GO 18650 mod by joyetech has been a solid mod, if you can call it a mod. The threads from the tube to the switch head are junk, they are rough and have a tendency to cross thread. The Bolt has many different versions to look at. The plastic or blow molded poly models should not be considered just for the obvious reasons. The bolt chrome version is very nice, the button on this all chrome model is metal and seems to hold up very well. You could get a chrome extension and kick up an 18500 battery or just go with the 18650 for a good solid all day or two vape. The biggest advantage I have found with the joyetech 18650 mod is the ability to charge the unit with the standard ego charger. Hope this helps you out. Just an fyi you may want to check out the ego twist 1000 mah also a very good choice. mikeandcarolusa.com just got two more 1000mah twist for $23.00 each
Josh