Bought primarily for recreation, I initially feared that I wouldn't get enough exercise but that is not the case since I try to conserve the precious battery to last the whole ride. Consequently, I'm able to go longer and further than with my analog bikes. (This is my first e-bike and I live in a mountain town.) The Larger size fits my 6'4", 195 lb body well. The bike is surprisingly comfortable and smooth. Unboxing and putting it together was super easy. I'm highly satisfied with all components with 2 exceptions:

1.) 160mm brake rotors are just OK (even my comfort bike has 180mm).

2.) Battery capacity - I have too much range anxiety while riding but maybe I just need to adjust my expectations and plans while I just have the smaller 375 Wh battery. I plan to get the 500 Wh battery as soon as it becomes available again.

I'm not used to such a heavy bike but I'm still adjusting to the trade-off (weight vs. power). I also just read that the Enviolo hub has a ~300 mile break-in period so that adds some drag now. I've had the bike for 2 weeks and went on 2 rides on nice days:

1.) 24 miles on gravel and single track, 1700' gain using 75% of the battery, using PAS 0 to 3.

2.) 41 miles on paved/gravel/dirt roads, 1885' gain using 100% of the battery, using PAS 0 to 4.

Config: Sirius with Enviolo IGH. Odometer: 450 miles. Ride: I commute 20 miles roundtrip on rural coastal roads often with 20-25 mph headwinds. Four short 5 degree hills. Range: @ 20 miles. One half of my 10 mile commute consumes @ 45-50% of the battery. Riding into the headwinds consumes 65-70%. I recharge at home and the office after each 10 mile ride. Add-ons, a rear rack from Sirius, a Suntour NCX suspension seat post. A Portland design works 27.5x2.5" fender on the rear and a SKS Shockboard XL fender on the front. Rear view mirror (can save your life).

Other ebikes I own are both Luna's. I have a KHS 3000 fat tire with 1000 Bafang BBHSD, 52v, 27AH battery (The Beast) and a Luna Stealth belt drive, Nexus 3 sp IGH with 500wh mid-drive motor and 36v 7AH battery . A quick and fun road bike.

The Sirius is well made and fits right between The Beast and the road bike. I'm glad I went with the Enviolo IGH. It is perfect for my type of commute. I doubt I'll ever buy another chain drive. As soon as you unbox it, put the Class 3 controller on. Also, use the Xplova app to set the sensitivity to HIGH. Neither of the Luna bikes have speed controllers and they are not required in the Caribbean where I live. It is the only Con to the Sirius. I'm looking at ways to dis-able it. I will buy the 500wh battery as soon as it comes back in stock. Suggestion to Vvolt, offer even larger batteries. I imagine plenty of folks will buy the upgrade.