Yep, starts when i push them in and stop when I let go as well.
Thanks for link, will check them out although I've had the same experience as you so far, the phones seem to sound the same and don't actually seem to be damaged.
As for what I think of them.. I haven't had them all that long, only bought them yesterday so am still trying to burn them in
From what I have heard so far - big big bass! Definitely lived up to the hype in this section, it's something you really can feel and thats a pretty weird sensation (I've also got the EX-71s and these still don't prepare you for whats coming). The highs/mids seem a little veiled but I'm hoping they'll open up a bit more as they burn in.
I also bought a pair of EX85s here (same drivers as the EX90s) and compared to the bass freqs they have less bass but have a much much better soundstage and clearer highs/mids. After listening to the bass freqs for a while it's like a breath of fresh air when you put the EX85s in. If only the EX85s had the same bass impact as the bass freqs
(Which reminds me, will have the try the clingfilm mod on these).
Another thing I like about the EX85s is that fact that they go in and stay in your ears so much better. I underestimated comfort/fit when looking for reviews before but now I realise the importance. The bass freqs always seem to need adjusting to get the sound right. I'm using the medium tips from the sony range of canal phones (the small tips from v-moda seem too small the the medium ones are too large).
Having said that they are very fun to listen to for short periods of time, especially on bassy songs. Can't stop thinking what the Vibes would have been like though.. also saw those at the same store.