Yep, the Epi Speedy is quite bigger than Mono (and Damier) in the same size.
I have Mono and Damier Speedy 30 as well as one Epi Speedy 25
(Actually, I bought Epi Speedy 30 and then returned to the 25 for the couple of day later.)
The 25 in Epi line is really adorable.
I love the variety of colors in Epi line!
Of course, the Epi is so durable.