Barrel Rider Games (and I will admit I love this name) is in the biz (so far) of producing a new class for a buck. Not a bad biz to be in really. There is always a new class that can be made, there is demand and people will part with a dollar pretty easy.
The newest class I picked up is the Undead Slayer. I love undead and all the classes and trappings that go around them; so slayers and necromancers are great in my book.
This class is a very specialized one, against other monsters it has the fighting prowess of the a thief (which isn't bad), but it shines against Undead. I felt the powers it received were fine, I think I would have started them at lower levels to be honest. The feel of this class is akin to the ranger. It has some sneaking ability, some magic and bonuses to fight undead.
If the Cleric is modeled off of the Hammer-era Van Helsing, then this class is more along the lines of a Captain Kronos.
The class might be a little under powered in some respects to be honest. But that is only a read-through and the proof would be in the playing. For example it does have some thief abilities that would aid a party in non-undead adventures.
In earlier reviews of products from Barrel Rider Game I mentioned that I didn't see the Labyrinth Lord Compatibility License. That was an error. It is very clear on the same page as the OGL. This book has it.
I also mentioned that in some of the other classes that I could not find the to-hit and saving throw progression for the classes. I also could not find it in this one. There is only about a page and half of text and about a page of tables. I am sure I would have seen it. I suspect that the undead slayer uses the Clerical to hit and saving throw tables.
I would like to try this class out sometime. I think it would work well in the right kind of adventure. Care though needs to be given that it does not interfere with the cleric's role of hunter of the dead.