I use a LOT of ginger when cooking, and the convenience of the ginger paste is something I don't want to do without.
Recently though I bought some ginger paste at an Indian grocery and when I opened it, I was met not with the wonderful aroma of ginger, but with a strong chemical smell. The brand was "Tulsy" and I'm pretty sure I've never seen it before. Typically I don't pay any attention to the brand of what is, in my kitchen, a staple, but it looks like I'd better start. And I'm throwing this stuff out. It smelled so strongly of chemicals I'm pretty sure I don't want to risk cooking with it.
So if anyone would care to share their experience with good/bad brands of ginger paste, I'd appreciate it.
And for the purists among us, yes, fresh ginger is always best, but I'm actually not currently in any shape to be standing at the kitchen counter grating ginger in the quantities I normally use it. I still use fresh ginger when it's really much more appropriate than the paste (for instance, for Pad Gai King), but right now I need to rely more on the ginger paste.