The two "silver legged" tables in Houston are Riley Aristocrat Tournament tables with championship cut pockets, these were the standard tables on the professional World Snooker Tour before the Chinese STAR tables which are now used.
I have actually been informed by the one of the proprietors of the club in Houston, that one of the Aristocrats they have was actually used in the 2006 World Championship.
Indeed, you are right, without the table heaters and the Strachan No. 10 snooker cloth, they would be far slower and less responsive than those used in World Snooker Tour competition.
Also, all tables used in World Snooker Tour tournaments will have brand new cushions, which makes the pockets a bit easier as the balls tend to slide into the pockets. After a few days play however when the newness has worn off, the pockets will generally play a bit tighter.