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Well I had my two 4500's in active service up until fw ver 1.20 when I decided to switch to a pair of 3700's (one as primary router and one as access point).The 4500 was fine until the fw fiasco started. I waited a year for them to fix it and finally gave up. The biggest problem I had was the frequent lockups and/or resets that kept occuring back then. I have 9 pc's on my network that automatically backup to two home servers on a daily basis. With the 4500 one or more of the backups would fail a lot of the time, with the 3700 no problems.The 4500 has a 400mhz processor while the 3700 has 680mhz so both have plenty of power available for their tasks. The 4500 has a little over 200mhz wan to lan speed while the 3700 has a little over 400mhz. The 4500 QOS (gamefuel) is definetely easier to setup than the 3700, but if you have a high speed WAN connection ( I have 50mb up 10 mb down, soon to double) you dont really need QOS anyway and likely won't notice any difference with QOS on or off. The 3700 has better wireless coverage than the 4500's did (same locations).All that said, I hope they get a solid 4500 fw pretty soon so I can put my 4500's back in service somewhere else in the family. Myself, I will stick with the 3700's.