Is the EF2A worth the money? I've read such mixed reviews on it. I'm looking ot try a tube amp as I've never experienced one before. I saw this on amazon: http://www.amazon.com/SainSmart-Assembled-Headphone-Amplifier-Transformer/dp/B008BGLN5G/ref=sr_1_1?s=electronics&ie=UTF8&qid=1368102719&sr=1-1&keywords=sainsmart+headphone And was curious. I know nothing of them so I wanted an opinion on a good starter Headphone amp. They'll be hooked up to my e07k (DAC) and driving my grado 225i's or hd280 pros.