I picked a BD-P1500 up at BB yesterday. I have a BD-UP5000 that I'm still waiting for Samsung to do me right by, and wanted to see what their latest player was like.
For me, the 1500 is very impressive. So much so that I'm considering selling the 5000 and keeping the 1500. Here's why:
1)
Its fast. Loading BD discs is much faster on the 1500 than the 5000.
2)
Bitstream Audiophile actually works 
. On the 5000, only 2-channel TrueHD is supported via bitstream, and nothing beyond DTS-Core via bitstream. I have a Denon 3808 AVR, so I don't need decoding on the player, but I would like my BD player to fully bitstream all the advanced codecs.
The 1500 scores on this point, right out of the box.
3)
No fan. The 5000 has a fan that can be heard 10ft back on the couch (when no content is playing). I've also seen some glitching on the 5000 when I had poor ventilation for it. The 1500 gets warm, but does not seem as affected by heat as the 5000.
Other 5000 owners or those considering it may be affected by other factors when comparing to players like the 1500:
1)
SD upscaling. I have an Oppo 983, so I don't plan to ever use the 1500 for SD DVD -- the Oppo 983 is amazing at this, surpassing even the Reon-equipped 5000 in my judgement. I know that for many people, this will be a consideration, but for me, it is not.
2)
HD-DVD support. I don't own any HD-DVD's, so losing that capability that the 5000 has really doesn't affect me. All my hi-def disc content comes from Netflix and Blockbuster, and they are all BD now.
3)
Profile 1.0/1.1/2.0. I have no interest in BonusView (profile 1.1) or BD-Live (profile 2.0),
at all.
I just want the disc to play, and don't care about extras. From what I read, even a profile 1.0 player will be able to play a BD-Live disc's title track, so I think the profile politics is a bunch of BS

.
My plan is to continue to eval the 1500 until my 30 days is up, then decide whether to keep it or not. My decision will be driven purely by whether the rumoured 5000 firmware update is out, and whether it enables bitstream 5.1 TrueHD
and DTS-HDMA. If it does, I'll probably return the 1500 since I don't think I could get enough of my initial investment out of the 5000 and with the addition of full bitstream capability, it would make more sense to keep it.
My $0.02...
-shoek