So far the Guru is rock solid at 235. I figured pretty quick needed the guru vent all the open for my 18.5" That slot for wires works great. Should of done that years ago. I had one of the original WSM's and that thing was rock solid on holding temps. I picked up a newer used one few years ago. I is not near as tight. When I got my Rec Tec I gave the older one to some friends. Should of gave the newer one. The old even after 20 years of use was still in good shape.