The Radius is a great looking mod no doubt, I would even consider picking one up but you can't compare it to the SX M Class. I own a couple of SX's as well as some DNA 40's and it's apples and oranges. The SX Mini isn't all that heavy and the battery cap comes off easy with a coin. Just as fast as unscrewing the two screws from the bottom of the Radius. The TL is outstanding and got even better with the new firmware release. If you want some nice battery caps that don't require a coin pick up one of these caps.
http://shop.elevatedvapeaccessories.com/main.sc
It's funny the SX get's slapped around now, it must be considered one of the best mods made since everyone is comparing to it.
The Blue Radius looks pretty nice, I may finally own a Provari.