Bbybaudio, I purchased the W-5 when I still owned a BAT vk500 with BATPAK. The BAT had far superior bass control and definition with my Aerial 10T speakers with almost endless supply of power in comparison to the W-5.
But the W-5 was easily superior to the BAT in every other respect except the bass.
Basically what I thought I was hearing was a congested and/or compressed and ill-defined bass that simply got worse as the volume got louder. Low listening levels weren't too bad.
At the time, I was well aware of the write-ups on the W-5's bass from the mags which helped persuade me to make the purchase. But I just assumed the amp simply was not a good match for my speakers since they do demand a bit of power. I sold the W-5 for an amp that had the speed of the W-5 but it's bass was even better than the BAT.
Then a couple of years later I was on Sim Audio's web-site reading a review of the W-5 and the P-5 by Peter Moncrief of International Audio Review and although he too likes the W-5, he described the bass deficiencies that I too had experienced.
I am now on yet another amp with a bass reproduction that is simply out of this world IMO.
Still the W-5 is a wonderful amp in many ways. And I think for some to many listeners the W-5 would be quite an eye opener for the musical nuances that it reveals, speed of transient attack, and for it's overall sweet presentation.
-IMO