this is why i stand by their products. I just had a tunze 6100 go bad.. pump is fine but the driver failed. they no longer make the driver for these pumps so i was looking around for a driver and could not find any. contacted roger at tunze and they are replacing the 6100 with a new 6105 at reduced cost just by sending in the bad pump. you can argue which pumps are better tunze / echotech all you want. its all based on preference.. but this is hands down great customer service. and why i always recommend their products as they always always do right for their customers