Benefits of Bech32 addresses? In Bitcoin core, when generating a new address for receiving a payment, you get this dialogue:



There is a tick-box for "Generate Bech32 address".

I understand that this is a relatively new feature not yet supported by all wallets. The tooltip help claims that 


  Bech32 addresses ... are cheaper to spend from and offer better protection against typos"



How much cheaper than the "P2SH wrapped SegWit address"? (and why?)
Don't P2SH wrapped SegWit addresses include check-digits at the end?


I did find a 52-minute Youtube video where someone with a familiar name was giving a presentation on Bech32 but I'm hoping that it can be explained simply and concisely for the non-technical end-user wondering whether to click that check-box or not.
Native P2WPKH Unspent outputs save 22 bytes as their ScriptSigs are empty instead of 0x0014{20-byte-key-hash}.
2)
Yes, there's already a checksum of the same length.
The newer checksum algorithm is

Faster.

Very high probability of detection guaranteed..

Can find where the errors are: http://bitcoin.sipa.be/bech32/demo/demo.html (Press &quot;address with errors&quot;)


Also, you might be interested in the list of Bech32 Advantages.