I used a Yorkville Block 40 for many years and thought it outperformed the much more expensive GK combo. I did blow the 10" speaker a couple of times but not a big deal to replace it. Sad to say, I had it out on a gig a couple of weeks ago and it was stolen when I left the room to play in a second location.
On the Walter Woods, I used the 100 watt two channel version for many years but was never crazy about the sound, especially with BG. I ended using it with an Alembic preamp which sounded better to me and finally sold it after the power supply blew for the second time.