Interesting that you should mention the Wyred 4 Sound amps. With curiousity having gotten the better of me, I recently acquired a used pair of the 250 monoblocks (more like monobricks, actually) to try out on my SoundLabs. The little amps drove them suprisingly well in spite of the difficult load. They definitely sound more forward than my Ayre monos, with a touch of brightness that I found to be just a touch irritating after a while. The single largest difference compared with the Ayres is a very definite shortening of the soundstage (i.e. front to back).
Keep in mind that these comments are 1) comparing what is in my opinion one of the world's finest amps to something that retails for roughly 10% of their cost, and 2) they were driving an extremely difficult load.
On balance, I would say that anyone looking for a high power, high efficiency amp and is on a budget would be very well served in auditioning these.