I have recently upgraded to a Tacx Neo from a Tacx Fortius Power Back. The Fortius was probably technologically equivalent to what the NEO is now all those years back when it was released.
What I have found in general is, if we assume the NEO is accurately reporting power, I am constantly around 12% below my previous power output. I completed the Watopia Figure 8 last night in 50 mins vs my Fortius effort at 44 mins. I have also found that having worked up to the top of C band races (zwift power) I am now struggling to finish outside of the bottom few in the C band.
This is not really a problem from a training/fitness perspective, but it is an indication that, despite the efforts of the programmers, not all trainers are equal.
I would be interested to hear from others who may have made the change to NEO whether they are also struggling to keep up.
I am on a Neo. I have two bikes, both of which have Power2Max crank power meters. Both bikes are within a couple watts of each other for equivalent times on multiple local climbs barring weather conditions. When I put them on the Neo, the power also matches up nicely with the Neo.
That said, I imagine your Fortius was reading high. Do you the another power meter on your bike you can use for comparison?
Yes, this is what I am thinking; my Fortius was reading high. Maybe 200w for an hour is where I am.
Same here… from Kinetic inRide to Tacx Neo with a 10% drop in power. no other crank or pedal based power meters to compare so either the Neo is wrong or my Kinetic inRide gave me a slight edge…pretty much at the back end in C races also.
I am not really bothered about being in the C Group but I know I will be beaten by others with off cal trainers. But it is still good fun and a great way to maintain fitness.
Hi Kev,
I had the same. My power output dropped when I switched to the Neo.
I have read some posts about the Neo putting out the wrong power but until I get
a different power meter I’ll live with it. I have a power tap rear hub.
(I used it with rollers, a nice setup for anyone who is interested).
Ps To make things worse, I decided to swop setups just as I got ill, so as to
exaggerate the difference and make me feel even better about my purchase 
.
Cheers
“Ride On”