Are Walrus overdrive pedals any good?

Yes. Walrus Overdrive Pedals are very good, especially for guitarists who value their tone. They offer some of the best driven sounds on the market today.

Is Walrus Ages a Tube Screamer?

The Walrus Ages isn't a Tube Screamer but it can produce a very similar sound, as well as many other tonal options, thanks to its five different gain modes and Dry Blend control.