First of all: This speaker is HEAVY. If you want to avoid heavy lifting don't even consider it for a 4x12!!! I can't remember ever handling a heavier 12 inch speaker than this. Not even close.
The sound is HUGE! Compared to classic Celestion models this goes deeper, higher, wider, LOUDER. It's ultra clean and wide range compared to the typical Marshall/Celestion sound. It's more in the direction of a Hiwatt/Fane kinda vibe. Clean, hifi and HUGE!
Perhaps not for everyone but definitely a top quality speaker. Great for metal with powerful tube amps. Back in the days it used to be a favorite for bass too. Bass speaker technology has developed a lot since the introduction of the EVM12L so I don't think anyone will consider it a bass speaker today. But it still actually sounds very nice for bass in the right cab and will hold up nicely if common sense is used.
A bit expensive but the quality of construction really is in a different league than most guitar speakers. Whether the sound is right will of course depend on what you're looking for. It's very far from a classic Celestion or Jensen style sound, that's for sure!