Excellent practice amp! Battery lasts for months
I started with the Fly3 which sounded great. Decided to add the passive extension cab since it's inexpensive. It's compact, lightweight and offers good tone/volume. I usually use the clean setting for technique practice. The extension cab adds more depth. I could play with this pair 10 o'clock vol and 9 o'clock gain without my house mates realising that I'm practising. Delay effect sounds good too.
The only issue is that it's not a good reference monitor when used with a bunch of pedals.