releaser vs vaccum tank

I want to know peoples experiences with sap releasers. I have one bush with a vaccum tank which is very dependable but I need something for my second bush. I want to know how trouble free they are. I like my vaccum tank but I am having a hard time finding one I want

[powerdub]

I have had the double verticle releaser for two years now and not one problem with it. It will take as much vacuum as my pump will put on it. 30" HG, to be specific. The relief valve stuck, oops. It is gilles bernard but Lappiere's is real good too. They also have electric belly releasers that have a pump on them when they get full the pump pumps the sap out where ever you pipe it to.