You will be very pleased with this combo. I've had both the 225's and RS-1's with it, and can't imagine that you'll find anything better short of the Singlepowers, and RSA Raptor at several times the street price of the XCAN v3 ($300).
Some might find the combo a little bright, but you can improve the bass and soften the highs by just reversing the bowl pads (turn them inside out) - which improves their sound, without muddying their sound like flat pads do.
By the way, the 225's sound almost identical to the RS-1's with the XCAN v3. And... as others have suggested you can improve the sound even more by modifying / rolling tubes of the XCAN v3 (
www.rockgrotto.com).
The C 640C or MH CD25 or ADiva 72/82T > XCAN v3 > SR225 combo is hard to beat.
And... if you really want exceptional sound add the rest of the MF Small X series components (DAC, PSU, Tube Buffer) with the deveiled HD650/Cardas, or RS-1's - I doubt you'll find anything better for less than $3000++.
Oh yes... all such observations must be made only after all components are well burnt in (minimum of 100+ hrs) - the sound improves dramatically, and is nothing like their "out of the box" sound.
GF2