I think for a bunch of us it will be our first mouse or keyboard from them. There are plenty of youtube reviews out right now for the current and previous offerings. The general consensus is the x17/x20 are basically great mice, but super old school design. The keyboards are basically the Razer Huntsman but mad cheaper $$ wise.  

Ive owned in the past  -- Build quality is as good as any other but shape wasnt for me

It looks like the X17 and the X20 are the same basic mouse with the X17 being wired with 8000hz polling and the X20 being wireless and having standard polling of 1000hz. Personally wireless isn't a big deal for me so I ordered the X17 but it's yet to come. Some youtube reviews exist and are easy to find if you look for "Evga X17 review" though I have seen some that seem upset that they didn't get sent a 3090 to review and a few that says it looks too "Gamer" for them I personally think being a gamer mouse that isn't a bad thing and people can see what it looks like before they buy. The technology behind the mouse and the general feel though they have liked but it also comes down to the size of your hand and the grip you use as to how easy using the buttons might be.
 
As for the keyboard it's looking pretty good especially for the elite price. The built in media keys are handy and mostly the scrolling volume is great as I often change the volume on screen then found the slider on the Z10 only at 50% or something like that when it was all the way up the wheel will fix that annoyance. Mine though hasn't shown up because UPS hasn't shown it as moving since Thursday after the original scan. That though is on UPS not EVGA or the keyboard. I really like the feel of mechanical keyboards and wouldn't go back to a regular keyboard after using one. I really want to try those optical switches since they seem to be nice and the lighting on my old Z10 RGB has been really well done. The biggest overlooked feature though for me is the RGB lighting. A lot of people use a computer in their bedrooms and having the RGB turn itself off when you are not at the keyboard is a great idea.

I'm using the Roccat Nyth (lots of customizable thumb buttons) so that Z-15 model is looking good.
As for the other two, they look a bit boxy, but I'm curious about that liftoff technology.
Does that mean I can lift the mouse (when it gets too close to the keyboard) and it won't go crazy?

I am wondering if I should wait for the mouse X20 or get the X17 right now before the elite price goes away. Does anyone know when the price will expire? Because I don't want to buy full price.
 
Thanks

Just received my x17 today.  It is to replace my logitech g602.  From what i can tell is the buttons are quite a bit easier for me to press, and i really enjoy that.  I wear a M size glove and i feel like the mouse is a bit on the small side.  Would love to get one of the keyboards, but not an elite member for that 50% off yet!
 

EVGATech_ErnieB

Linkupdated
I am wondering if I should wait for the mouse X20 or get the X17 right now before the elite price goes away. Does anyone know when the price will expire? Because I don't want to buy full price.
 
Thanks

The Elite pricing will be going on until the end of the month.

so does that mean the X20 will be available by the end of the month??

Linkupdated
I am wondering if I should wait for the mouse X20 or get the X17 right now before the elite price goes away. Does anyone know when the price will expire? Because I don't want to buy full price.
 
Thanks

The X17 does have the faster polling rate of 8000 vs. the X20 having around 1000 for it's polling but it is wireless. Really I think it comes down to if you can stand the wire or if you need wireless. Even while the X17 is a lower model number the fact it's wired does have advantages over the X20 and physically they look to be the same mouse. Also it looks like the X20 doesn't have the removable weights as an option probably to make room for the battery.