There is a Forum user who used to be very critical about his Allant+ 9.9S. He stopped complaining after he bought a Vado 5.0
In 2018 I purchased a Trek Super Commuter +7. I like it a lot and put about 3k miles on it. I ride a lot on the American River Bike Trail and was always conscious about the Bosch Performance Line motor’s whine noise while passing joggers and walkers on the trail, so I would usually coast by them. I don’t own one, but I hear the new Gen 4 Bosch Performance Line CX motor is still loud, much louder than the comparably powered Brose, especially under load. This summer, my wife and I got 2020 Turbo Vados, her’s is a 5.0, mine is a 4.0 (both are N+1). We have had ZERO problems. Once or twice in 6 months of riding the Turbo Vados (1.5k miles) I noticed the assist hadn’t engaged at startup, I didn’t stop riding, I just just rebooted on the fly and the assist kicked right in and worked fine. I had similar issues with the Bosch motor assist not engaging, only it took longer and I had to stop and fiddle with it more to get the assist working again. I don’t think this is a SOP issue on either motor. I like my SC7, but one thing the Bosch motors can’t do, is shut up, they have a constant annoying whine, especially when under load. The Turbo Vado’s Brose motors are super QUIET, nearly SILENT, even under load, and after 3k miles of listening to that annoying Bosch whine, the Brose SILENCE is sooooo nice. It is a huge, night and day, difference. Now after being spoiled by the Brose silence, the Bosch whine is even more annoying. I guess if most of your riding is off-road, not on pavement, the whining noise wouldn’t be so bad, but these are commuter ebikes designed to be ridden mostly on pavement. Since this is a Specialized forum, and since I own both Bosch and Brose, I thought I would quietly (pun intended) chime in!