L-Theanine Powder Review by mindlube

I thought there was only one mfr of L-theanine and that it's brand name was Suntheanine(r). Is this the same product, or something else? Is it part green tea extract, or 100% L-theanine?
(Compare with the ingredients of the NOW Foods Theanine, which includes part green tea extract, part Suntheanine(r). Thanks in advance.