We stayed three nights in the camper van and used it to explore Maui, and we couldn't be happier with the experience! The van is just as advertised and although it was my first time driving this kind of vehicle, I got used to it really fast and had no problems on the roads or parking. We took it up to the summit of Haleakala National Park and it did great on the way up and down, no issues.
We had some warm nights, but the fan inside helped with air flow and we were able to sleep fine. The bed fit me fine at 5'5, but if you're any taller you may not be able to fully stretch out when sleeping. The bed was comfortable and the width was fine for two people. We appreciated the included beach gear and cooler, which was just the right amount of stuff for a 4 day trip.
I definitely recommend trying van life with this camper van--we booked two nights at a campground in Lahaina which was great (outdoor showers, toilets, access to the beach), and one night in the campground at the National Park on Maui (access to sunrise at the summit in the morning). We saved money by traveling and staying in the van and still got to see everything we wanted to (we did opt to skip Road to Hana). If you want to save a bit of money and explore the island, this is the way to go!