I was on Curtis' site years ago looking for a stabilization chamber back when he used to make the acrylic chambers. Well, life happened and took me away from my shop focus for a season.
I was thrilled whenever I returned to the site to discover Curtis was offering a cylindrical Juice Proof chamber. I love my 4" chamber, it is a very durable, quality, well made chamber. Just to hold it in hand- speaks of design excellence, durability and of a craftsman that pays attention to detail.
Afterwards, the interior cleans up nicely with a mild soap and water. Pleased! is the only word.
On another note, I have always found Curtis to be very helpful and willing to resolve any issues should any arise. He's even given me some pointers regarding vacuum pumps.
If you are debating on purchasing a chamber, "Trust me you will be glad that you did".