I purchased the generic neotame and it was a disappointment for the following reason:
I diluted it at the rate of 0.06 grams per gallon of water which is supposed to simulate the sweetness of 1 pound per gallon of sugar. The first sip tasted properly sweet but each successive swallow was less sweet until by, maybe, by the fifth swallow, it tasted about 30% as sweet as it should. Apparently, it has a desensitizing effect on my tongue. If my reaction is typical, neotame will never achieve wide spread use. Also, I tested neotame in combination with 1 gram per gallon stevia extract. The stevia actually decreased the sweetness.
In contrast, stevia extract (1 g/gal) was synergistic in combination with sucralose (0.5 g/gal) and I highly recommend that combination for sweetening beverages.
My source of stevia extract was
http://purebulk.com/stevia-extract-90 and I bought this scale, AMW ES-100, for weighing to 0.01 gram accuracy,
http://purebulk.com/scales-digital-gram-weight . Incidentally, Pure Bulk has unusually low shipping and handling rates.