Depending on the speaker and the venue size, most would find it easily loud enough.
I have the upgrade Celestion C90 in mine, which seems more sensitive (and sounds better, IMO) than the stock speaker that a friend of mine has in his .22+.
And an extension cab will up the ante considerably.
I have gigged with it and the only cons (if you consider them cons) are lack of clean headroom, less output at low frequencies, and shorter tube life (small amps just have to work harder...). Some would like the earlier breakup, not mind the low end (or lack of) and can afford new tubes more often.
So to each his own....
I love mine. It has a rather unique tone that I really like. Cleans are really good. Would not call it a "Metal amp" but it can get pretty dirty for hard rock. Plenty of gain, IMO, for most styles. Mine also has the optional graphic EQ, which makes it more versatile.
A distortion pedal can provide almost any sound you like. And it does take pedals well.
If it is in really nice shape, $450 sounds like a good price, esp. if it has the graphic EQ and/or the upgrade C90 speaker.
Seen the price on new USA built 20w amps lately?
You could do worse! :wink: