The quality arguably lies not in the eel itself, but in the experience as a whole. The innately stickily sweet una don itself is highly customisable - you get different sauces to apply to your mountain of eel flesh, and also the option of adding dashi to make an eel porridge - and you also get to grate your own wasabi, which may either be balls of fun or immensely frustrating for those (like me) who drip with sweat in SOC-esque effort only to yield sad green Play Doh-esque baby lumps. Likely to remain exciting for a while because of the current buzz and redeemable bragging rights, but what happens after that...3.9/5
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P.S. I went at 8:45pm on a weekday night, and queued for all of five minutes. Yay.