I have one and I highly recommend the wifi card. I also have a slightly working Carbon Dioxide sensor - I say slightly because it's readings are consistently off when compared to my Aranet. Supposedly there's a way to calibrate, but I haven't had time to dig into it further.
My only issue with the device is that I wish there were more tamagochi elements to the dolphin buddy.
The Wi-Fi card is a must in my opinion. Learning about EAPOL handshakes, hashing, cracking and list vs masks was an awesome use of some 200 hours. Obviously I only used hardware I own and configured, but boy do I feel like Mr. Robot lol.