I bought this one because my original one has gotten old from weekly use.  In my crime ridden home town of Stockton, CA, I wanted to be able to roll it under a juniper bush and keep it chained to the bars on my window.  This unit is light, really as portable as you could wish and is truly versatile.  It's one-touch design is nice but the patented shape and very well designed heat and ash adjustments are what make this a joy to use.  It's comparatively heavy construction insures conductivity and consistency--you know immediately it's a quality product.