Well, if youre looking for a good deal, you can find brand new, unopened dual 2.5's on eBay with Tiger for $2300....or $200 cheaper than a new dual 2.3. 😀 Only "downsides" are as follows:
1) 8X -R only Superdrive instead of the 16X +-R and DL Superdrive
2) 160GB HD instead of the new 250GB
I purchased the dual 2.5 on eBay for $2300 because i had a 300GB SATA drive and a 16X dual layer DVD burner that i was using from my old XP machine.
As far as problems, there have been ZERO with my dual 2.5. I absolutely love it. Buy yourself one if you can live with the slightly smaller HD space and spend the extra cash on some more RAM!