My Frigidaire of two years just died and the warranty replacement one cost me $53 for the state recovery / recycle fee. The new dehumidifiers are made soooo cheap its not even funny. Paper thin evaporator coils that leak Freon or the compressor dies. I have owned Sears, Samsung, Frigidaire and GE and none of them seems to last. The upside to Frigidaire is the refrigeration system is warranted for 4 or 5 years. If you are buying new go for the best price & warranty.
Good luck with the extended warranty. If you have a service center nearby that's a plus but you will still be without a unit until fixed. I went through two (2) Samung's and when the 2nd one died thay gave me a full refund because they no longer made the same model or parts for it. Samsung parts come off a slow boat from Korea so you will be waiting if you need parts. Its because of the repair wait I purchased a 2nd unit ( different brand ) and have alternated back & forth to keep one working.
I like to keep the humidity at 50% and the basement temps around 70.
I might break down and buy a commercial unit like a Dri-eaz or similar.