You're talking 1amp vs 1.5amps between 5w and 7.5w..I've been using 2,4a charger (but prob pulling 2.1) for last 2 1/2 years on iphone6+...still going strong
im sure your £1k phone is smart enough to know how much power is required to charge its own battery, iPhones support 7.5w and android phones support 10w plus with the new 3.0 smart charging tech the phones are in good hands
Slow charge is better for your battery tho, so I'm tempted..ive just spent a grand (two years) on a Phone, last thing I want to do is degrade the battery.
Not really, the charger will out live the phone
Thanks, I'm going for this :) Reviews for this charger here