Anyone Play HARP?

I have a crapload of the system in paperback - bought when whatever entity that took over for ICE was clearing out inventory. Heck, I just picked up the HARP 2nd edition rules in PDF for 5 bucks (I got a link - if you want the link, let me know - I won't be posting it  it's in the comments of the post) and truth be told, I don't know what the differences are.

Heck, I'm not even sure what the difference is between HARP, Rolemaster and Rolemaster Express.

The thought did occur to me that if I wanted to run a smaller group, say 2 to 3 players, a system like HARP (if you want levels with skills) or Crypts & Things would be the more obvious choices. I suspect with the critical charts, HARP would be a tad less forgiving if the players ran into a stretch of bad luck.

So, can someone tell me a bit about HARP? Is it worth me breaking out the books and giving it a serious read through? Is 1e all that different from 2e? Or should I move them on to storage? (I think the Loot book looked portable to other systems, so that might stay)

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What is the Difference Between HARP and Rolemaster?

I always really liked Rolemaster... as a player.  I just could never find someone willing to GM it.  In the end, I would find myself running a MERP / Rolemaster combo of sorts.  Always fun.  Always full of improvisations, as my fluency with Rolemaster was never quiet where it should have been.

Back when ICE was still a publishing company (in some form) I picked up a fairly complete collection of HARP books.  HARP, High Adventure Role Playing, was also published by ICE, and to my inexperienced eyes, seems damn close, if not identical, to Rolemaster.

What are the major differences between the two?  Is HARP closer to Rolemaster Express than the full Rolemaster rules?  (Rolemaster Express was a nice consolidation of the RM rules).

Should I keep this stuff handy, or pack it away with the bulk of my RPG stuff?  Space is definitely at a premium.

As an aside, I can find the HARP Sci-Fi RPG at RPGNow, but not HARP itself.  Is it a dead system these days?