Trapper, if you are looking for most bang for the bucks go with the Silver Bullet from Utopia-Silver . Note that it does not have a fancy clamshell cover nor does it have an automatic stirrer (I wish it did) It includes a timer and TDS meter. Thanks to its higher voltage, it produces a bit more colloidal content than most other generators, Now, if you want the automatic stirrer and bit fancier look and don't mind paying twice as much, I suggest either the Silver Puppy or the new SilverGen model. Both are good units and the new SilverGen is reputed to make smaller particles than most other units. And, Trapper, you know that I know Colloidal Silver . : )