I bought my tub back in may 0f 2006 living in the north brought many questions about winter and what if what if, i am mostly worryed about lines freezing because dynasty spas are built in tennesee, usa. and most the tubs we looked at are bulit here in canada with insulation ect... to protect against those weeks of -30c weather this tub has the spray foam and from what my dealer told me i should not have any trouble as winter starts to set in so far so good, the selling features for me was the us of led lights built right into the back of jets, 2 not 1,2, 7hp jets give more than enough relaxing power even when i over populate my 6 man tub with friends, i went with a pearl finish to bring out the lights and the many different settings, i was not dissapointed lighting up the whole backyard. Other awsome features is the ozone generator and the stereo not just little tower speaker, full 6in waterfroof mids and i think the tweets are 3in the down side is the speakers are on one side of the tub only but more than enough vol to piss the neighbors off, just hard to hear on far side of tub when jets are max out. The one down side is the grvity feed drain in the bottom corner of tub, with twice as much hp as some peoples boats motors i figure they could have coverted a pump for draining, instead of a drizzle. All N all i love my tub i am a avide user and as hottub season is almost here, i will be putting the usa made tub to the test in the frozen canadian winter, also i would like to thanx polar spas (alberta) for all the great advice and ongoing support, so a guy like me can keep a healthy, clean and safe spa for me & my family