I have had a Slingbox for almost 2 years. I purchased a Hava Gold about 2 months ago. It never work on my Vista machine. I did get it to work on an XP machine but the software was extremely unstable. I worked with tech support and actually talked to 3 engineers from Hava and I came to the conclusion that the box while having lots of potential, the software was NOT ready for consumer use. Whereas the Slingbox via Vista, XP, PDA, etc. works, works all the time and works very well.
I sent my Hava box back and got a full refund and used that refund to buy a Pro unit. Best decision ever. I was gonna do a write up on the Hava unit but to me it just didnt work so the pro and con analysis was useless in my scenario. Now others may have working Hava units but if I wanted someone to give me advice, I would want them to go Slingbox all the way. Great product. Absolutely fantastic and you cant go wrong with them.