I have a gen 1 Drivo. Elite is still the only trainer make that uses a real power meter and the most accurate. Haven't need a firmware after leaving the factory. Response is not as fast as other trainers in erg. Neo is probably the best overall but recent design changes makes it more difficult for repairs and being own by Garmin now makes logistics questionable. Heard a lot of good reviews for Hammer 2 and it's probably has the quickest erg response. Wahoo is my least favorite (still can't forget them for the middle finger given to everyone not using apple). Gen 5 seems to have shaken off all of the QC and design faults for now. Only took 8 years and feel bad for the unlucky beta testers. Lots of praise for their support but I would rather have a product not needing any. Got to given them credit for innovation but not sure if there's anymore game changers left (a static to full rocker option with a foot mount would be nice) and others are starting to offer better mousetraps.