I have always used antique keyboards like Cherry MX 1800 or Cherry MX 8100 and almost always have modified the switches in some way, like on the 8100 I had replaced the stems of all the brown switches with black switches’ stems while leaving the springs of brown switches to make them linear and softer. 
After the recent OS update my Cherry MX 8100 was registering a double pressed key once, so I thought of buying a new keyboard. I bought a Corsair K70 RGB MK.2 Low Profile keyboard from a local store, but haven’t used it yet. This is the first piece of text I’m writing with it.
On the Corsair’s website this keyboard is currently priced $99.99 USD (Was $149.99 USD), while the regular variant is priced $169.99 USD. Here at the store, both of the types are priced the same. I still have two days to exchange it with the regular variant if I want.
Why is there so big of the price difference on their official website?
Right now it feels fine, but I don’t know if it will still feel the same a month from now or not? Like my MX 8100 felt the same after it accumulated a huge amount of dust.
Do I keep this keyboard or bring the regular variant of it? Has anyone used any low profile mechanical keyboard?