The xbits just were too unreliable and problematic - most people found that they would work for a while, then dislodge themselves very easily. Soldering is the way to go anyway, its much easier than you would think and is worth the effort in the long run.
If you REALLY want a solderless chip, you would have to buy one of the newer chips that are on the market and a solderless adaptor to go with it. Again they arent really very reliable but work for some people.
