Looks like a great deal if wanting both upgrades for your ender 3 or clone. Promo deal so need to add https://www.amazon.com.au/dp/B08T1VJ9ZT in addition to the PEI sheet. Also works for the double sided sheet but without the 10% discount.
Also make sure to tick the 10% coupon on BOTH items before adding them to the cart or before checking out.
The sheet and z axis upgrade seem to have mostly decent reviews but at < $28 for both you can't really complain too much.
A very good deal considering a textured pei sheet got for around $20+ and z axis kit $30ish