Hm. Very nice.
So... what's the game like? Is it obviously derived from / inspred by any other RPGs out there? What are the key differences between HM and HM Basic? Also, are they interchangeable, like say, wrt the HoB?
You will definitely see elements that remind you of other RPG's, but nothing that is hole sale the same as other RPG's. It uses opposed D20 rolls for combat and saves, the skill system is percentile based, and there are lots of fiddly bits to add to combats. Perhaps the biggest difference, which people will either love or hate, is healing is not easy. Even with a cleric or two it will take a very beat up party DAYS to recover. Only 2 to 3 days if your lucky. Without a cleric it can take months.
They addressed the god like spellcaster issues by seriously curtailing how many spells they can cast by a creative cost/benefit spell point system, which also allows you to alter the base line spells by spending more Spell points. So for those who hate the classic D&D magic fire and forget system, you may LOVE this system.
Hackmaster Advanced is not out yet, but yes, it will be very compatible.
One thing I like is that even thought there are a LOT of fiddly bit rules I can ignore them and run it very basic, which is hat I did, and still found the game to be enjoyable.
Another thing people may love or hate is that races make a big difference, Skills/classes are bought with Build Points, and you can get more BP's (in Basic) by sticking to your straight 3d6 attribute rolls, plus there are other options, and I am sure more will be in Advanced.
So Hackmaster (the new one) is well worth checking out, but as always it will depend on the individual as to how well it is liked.