I bought this one from Amazon about a month ago. I like it better than valve-on-top models, and the borosilicate glass on it is very very thick. It has worked really well. I also purchased a big pump - 8CFM - so I can move air quickly, which is important for the type of silicone and resin I work with.

No matter which you choose, trust your Spidey sense, especially if the reviews are horrible. And stick to the limits religiously. I treat my vacuum chamber and pressure pot both like ticking time bombs and use maximum caution around them. Pressure vessel failure is no joke!