I used that site and https://futlight.com/ for documentation purposes but I only purchased from Aliexpress (RO country code so they’re probably arriving faster in the UK 
; anyway, recent deliveries from China took more than 2.5 months).
There are additional discussions on the ESPMH Github in regard of the compatibility between bulbs and remotes and the settings needed. You might also look into the FAQ for ensuring you will not be disappointed when the bulbs arrive (or otherwise go with Hue/Hue clones such as Gledopto or generic Zigbee; with Zigbee2MQTT you can also bind remote to bulb so that you can control lights even if every wifi/HA/Hue hub device is down - similar to Milight).
Getting to know their performance and compatibility issues will help you set a base point for the expectations. Milight are no match in regard of performance vs. Hue (average response time won’t let you integrate them into Ambilight like clones) however they’re a great cost/performance solution if set correctly.
For the gateway I use also these https://www.aliexpress.com/item/1859110962.html in order to stabilize power supply (or simply use a 4.7uF capacitor) as there are many NRF22L01 knockout clones and some very long Dupont connectors in order to prevent interferences. I use mine with an Asus 10,000 mAh passthrough power bank in order to not loose connectivity case of power failures. Once I removed, by mistake, the power cable from the power bank (it worked for 2 days just fine and would have probably worked even longer if I had not realized it ).