The back of the Sparkfun unit says 550W.
The diaphragm pump is pretty quiet. It sits on rubber mounts. On the lowest air, you can just make out a low hum 2ft away like a transformer. I'm not sure which is better but judging by the size, it looks like it's built to last; it's just an oversized aquarium pump. One of the complaints for the Sparkfun unit is that it produces too much air flow. Overall, I'm happy with its performance.
American pricing can be deceiving. When you factor in the dollar exchange, CC foreign currency markup (2.5%), courier customs brokerage fee (% or $40 flat <==got dinged for that once), no tracking if USPS and who knows when/if it'll arrive (TEquip doesn't recommend but only $10 CanadaPost brokerage fee). Fuck that hassle!
I liked the Quick too but I only found digikey.ca selling it; for CA$223 but with free shipping and only HST added. And I can have it next day, typically. Availability of spare heating element factored into it too (avail. from digikey.ca) though I doubt it'll fail anytime soon.
I have no experience with AliExpress. I don't fancy waiting 'till the spring thaw. Or pay double to receive it a mere 2 weeks from now (DHL $56). But mainly, I really didn't like the 858D because of the buttons and the proximity of the fan.