Just got my copy of heroes and having thumbed through each class, so these are my first impressions:
Kloon Sage - great to see a new race to play. They are described as green skinned (and crimson eyed) in the Kingdoms of Terror, but actually i prefer them in this guise, more dwarfish (or possibly gnomish).
Ice Barbarian - again, good to see another race. Would have been nice to see a shamanic variant, but nice class.
Brother of the Crystal Star - I like the flexible use of magic with this class. I would have included a Crystal Star Pendant with the starting equipment though (one reroll per adventure)
Herbwarden - Think they got this right, but would have liked them to be able to produce non-healing potions, such as sleeptooth brew etc
Dwarven Gunner of Bor - Good class, although essentially the same as the d20 version. I think they should have offered more than 10 disciplines, using the other d20 abilities, such as Shatter Shot , Smoke Shot, Roar of command and Expert Smithing.
Knight of the White Mountain - Good to see this class - I think they should have offered additional disciplines linked with the three types, so ranger abilities for Skies etc
Vakaros Warrior-Mage - by far my least favourite class - this is similar to the d20 version, which I didnt like either. I wish they had included the Old kingdom battle magics, depicted in Jungle of Horrors, and the grandmaster books : Invisible Fist, Penetrate, Halt Missile, etc. At least the name is right this time round.
Magician Of Dessi - I guess i have to accept the fact they once again ripped off grey star, but the abilities are too good for one npc, so I understand why. What happenend to Evocation though? Seems to have become Sorcery (which has become a healing ability), rather than the power to commune with the dead. And I think the Alchemy Discipline should do a lot more than make Endurance or Willpower potions - more like the grey star use, creating potions from herbs etc.
Telchoi Warrior - similiar to the d20 version, but still pretty good. Wish they were called Telcharim Warrior though.
Buccaneer of Shadaki - I like this class, and can be used for other pirates, such as Buccaneer of Lakuri etc.
Border Ranger - Good to finally see a ranger type (other than Kai). Now if we could have a rogue and a priest, all areas would be covered...
Knight of the Realm - I am not a huge fan of this class, but if you want a chivalric knight, you cant go too far wrong.
Overall, I think where possible, for greater customization, each class should provide 15 or more Disciplines so you dont have to choose the same ones as other characters of that class.
Character sheets - atrocious!
Equipment - I was a little disappointed with the new equipment charts - not for scope though. The range is impressive I admit. No, my main gripe is inconsistency between this and the other 2 books. For example the humble arrow , which depending what book you use, either costs 1 GC each, 1 GC for 6, or 1 GC for 12. A chain mail vest costs 45, 50 or 80 Gcs, a Shortsword costs 7 or 25 Gcs etc. That to me is a little annoying.
I think this is a mixed bag for me, but overall, I think its pretty good -there are some things i am keen on, others I am not. Definitely of use, in terms of invaluable background on the new classes though, so I think its worth purchasing, and it offers a good range of characters to choose from, which is really important.