Rode this yesterday.
It's a good Ghost Train ride. Not the best one I've done, but it does have a nice story which you can sort of follow (which is less common in my experiences with these rides).
Without posting anything too spoilery, but also giving mild spoilers, I particularly liked the mirror scene and the final scare (the physical prop is well hidden).
At the same time, there's 3 scenes which are effectively just pitch black, and they don't quite work. One almost does, because it's a "hide and seek" style scene, but it needs something a bit more (lighting effects with eyes or something). The other two pitch black scenes need something.
Now here's something which seems to be controversial. I preferred Duel. I significantly preferred Duel. Part of this is because I'm a sucker for interactive / shooting dark rides, and Duel was just a ton of fun for me as a result. The other part of it is that Duel never felt like an attraction which took itself too seriously. It had the spooky / scary theme, but seemed to have a bit humour / light-heartedness sprinkled in a a result. Alton Manor takes itself a bit more seriously, and goes the full nine yards on the creepiness scale, but doesn't have any sort of humour or 'fun-ness' to it.
Now this is very much just a me thing. Is Alton Manor 'better'? Yeah, probably. It's got some cool effects and a nice story and a good creepy vibe. It's definitely on the higher end of ghost train rides I've done. But given a choice, I would rather ride Duel any day.