Just aiming to help owners of first-gen Retina MBPs to decide about upgrading or not SSD and Wi-Fi card. Trim was successfully enabled by entering the command "sudo trimforce enable" after moving partitions from the original SSD. I had a dual boot scheme (Mavericks + Mojave); moving Mavericks partition to the new drive was straightforward, basically clicking the "restore" option from disk utility. Mojave partition, on the other hand, could be moved only by using Carbon Copy Cloner. In short, both are upgrades pretty easy to do. From Black Magic Disk Speed Test, performance gains from the original SSD were about 25%. The Wi-Fi AC adapter also seems more responsive than the original adapter; bluetooth features like the "take photo" function from Mojave seems faster to negotiate with the phone.
Got the Wi-Fi adapter from this seller:
https://www.aliexpress.com/item/Bro...052.html?spm=a2g0s.9042311.0.0.77c34c4dYHNYPt
And Transcend JetDrive 725 from this seller:
https://www.ebay.com/itm/Transcend-...5:g:itoAAOSwMO9bzc5u:rk:4:pf:1&frcectupt=true
Got the Wi-Fi adapter from this seller:
https://www.aliexpress.com/item/Bro...052.html?spm=a2g0s.9042311.0.0.77c34c4dYHNYPt
And Transcend JetDrive 725 from this seller:
https://www.ebay.com/itm/Transcend-...5:g:itoAAOSwMO9bzc5u:rk:4:pf:1&frcectupt=true