I've used the Silvonic for about 2 years and never had a problem. It comes with a TDS meter so I can check the distilled water first. The automatic shut off means never ruining a batch by forgetting about it. It makes clear CS that doesn't degrade in light.
The people at Elixa are very helpful and will take as much time as needed to answer questions.
I like that it has a lifetime warranty and is made in US!