I have the 3152 and 3155 and have no complaint about either the 3155 has been going since 2012 and the 3152 since 2016. What people don't understand about the 3152 is that the timer redundancy is short. If you keep having to reset the unit this is not because the unit is faulty but because your tank has a high enough evaporation rate that you need to adjust the jumper in the controller or upgrade to a 3155 on nanos the 3152 is perfect.Thanks for all the responses.
I have used the autotopoff.com set ups in the past, but because of space restrictions I was avoiding the hang on tank brackets.
It still seems like there is a lot of differing opinion on this topic. I realize the Tunze i the standard bearer in this market, which means I will probably just bite the bullet on the 3152. I am not completely convinced now that I have read so many negative reviews, but I know I have been reading about them being the best for years. I just hope I end up with one of the good ones.