The proof of the pudding is in the eating.
Buy a unit from from the link you provided but with the proviso that you can return it for a full refund if it doesn't give acceptable performance. (Don't forget to get the saleperson's name so you can support your claim for refund if needed and RETAIN the purchase docket and all packaging).
Many stores will refund in such circumstances but some insist on supplying other goods to a similar value instead of a cash refund, so make sure of the store's policy before you purchase.
The effectiveness of WiFi of any nature, is very dependant not only equipment, but also siting and building construction. Ultimately, it's a situation of "suck it and see", hence my opening statement.
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