[rvitko]

It is a $140.84 price difference, the 3/4" magnet holder costs $62.08 more, the 90W power supply costs $133.17 more if bought as spare parts. I don't disagree with you, if you have no use for the stronger magnet holder, I would get a 6150, the flow is the same, it is much quieter, longer warranty and only approx $60 more. In most cases it would be better to use more 6105's than 6155's, the only place I see going 6155 is you need a magnet for 3/4" glass, a little more flow and you want the far more robust and durable power supply, short of getting wet the 90W power supplies virtually never die, the 50W, last about 5 years.