I don't have the 1605CDS, but do have the 1405 series. Running XP Pro on it. Runs nice. no problems whatsoever so far. Done my fair share of tweaking so it doesn't call home or do any of that stuff.
Never had driver issues either. Had also one time reformated and used 2kpro before. I went back to Xp pRO with a custom install so I can have my partitions.