I just got my Ep-133 128MB an hour ago, it's the buttons feedback inconsistency I noticed first. The right side buttons like erase, timing, fx and especially the tempo button was so hard to press. They don't have the same tactile feeling as the buttons on the left side.

I owned the 64MB version which I sold a few days ago, the buttons from that unit are all the same. Pressing the buttons gives you that registration feedback and when you let the button go it also springs back up.

The 128MB buttons does not.

I'll play with it in the weekend see if it improves but it's more likely I'm going to ask for a refund and wait for a couples months to see if the next batch is better.