You should only be able to detect energizer or nutrient if you over-use it. I've not used it in the past, and since I've started using it, I detect no negative flavors. if anything its better, because the yeast was happier from the get go.
when i'm out of nutrient and energizer I plan to get some fermaid.
Primary: English Mild
On tap: Pale Ale, Lancelot's Wheat, English Brown Ale, Steam Beer, HoovNuts IPA
Bottled: MOAM, Braggot, Raspberry Melomel, Merlot, Apfelwein, Pyment, Sweet mead, Cabernet
Gal in 2009: 27, Gal in 2010: 34, Gal in 2011: 13, Gal in 2012: 10