Yes, it's worth it. Definetely.
The way I use Jade is:
Backup system:
For each wallet I hold 2 backups, as follows:
- Backup 1: Seed phrase, QR code
- Backup 2: Seed phrase, QR code
Obviously the backups are in separate locations (the one is easily accessible).
Usage:
Every time I want to use Jade, I do the following:
1. Turn it on.
2. Scroll twice and click "Options".
3. Click "Temporary signer".
4. Click "Scan QR".
5. I do scan the QR code and my wallet is ready to sign transactions.
6. I turn Jade off. The memory is automatically flushed, so if you turn it on, nothing is saved.
So I mostly use Jade as the SeedSigner and after each usage, nothing remains in Jade's memory. So if someone gets access to it, they can't do anything. Obviously, if they get access to one of my backups, then my funds are gone. But the device itself can't help someone to compromise my funds.