I have not used them. A quick Google search shows a thread from TripAdvisor back in 2014 where there are a few people saying it is a very slow process to deal with them, and they provided bad info to one person. Another thing I do not like about them is that if you take a look at their website, they are using images that are most likely stolen from other sources. For instance, the images they show for Aruba Surf Club are either images taken directly from a Marriott website or from quick Google searches.
I've rented my Aruba via bb.visitaruba.com and aruba-bb.com, as well as via TUG Marketplace. There are several other places. I usually just want to cover my MF and maybe get a few extra bucks. I rented my 2016 week and rented it within a week via those Aruba pages. That was back in September.