I'm in the 'real world' and I pronounce it [et] or [ɛt]. I don't know how I would choose which I say, just depends on who I'm talking to I guess.
I should point out here that I'm using IPA symbols. I've noticed that dictionaries use the vowel /e/ to represent the vowel I would write as /ɛ/. See this link for a pronunciation of the sounds.
The International Phonetic Alphabet - Audio Illustrations
My accent is Scottish English, which has hardly any diphthongs.