This has been on my mind with regards to their AIOs as well. They do have a good warranty period, but I've never had to use a warranty with them so I don't know how simple that is (more of an e-waste concern than replacement cost personally).
They also release a lot of AIOs similar to what they do with air coolers which makes me wonder how many pump designs they have. Only the most recent models list more pump details and from that I could see the Frozen Warframe, Aqua Elite and Hyper/Grand Vision each use a different pump. Grand and Hyper using the same makes me hope that perhaps it's the same pump within each model lineup, but impossible to say.
Looks like that's using one of the new 28mm thick fan designs. Of course this also made me look up the Vision AIO line and see there's Grand, Hyper, Elite, Mjolnir, Core and Frozen models.