Any of you tried, or own one is these for the G20?

http://www.rockyourglock.com/custom/MEC-CBGL20.htm

That is pretty high dollar

I like this one
https://www.youtube.com/watch?v=UO71TlsAKik

I have owned one for about 4 years now. I have a dedicated G20 gen 4 lower for it (lightly used and inexpensive).  For me it is currently almost purely a fun gun, but I could see myself using it for hog hunting or two-gun alongside my G20 (which would only be financially viable if I started reloading). It can also fill the home defense role when I move into a house rather than an apartment where it is currently way beyond what I need for that role.

I absolutely love it.

In my opinion (obviously biased as I chose it over other options), this is the closest to my ideal 10mm PCC that I've found yet. Short and handy, reasonable weight for a firearm with a reliable simple straight blowback mechanism (though with hot 10mm I certainly appreciate that it isn't a featherweight since recoil is minimal), magazine feeds through the grip (which I believe to be the way a PCC should properly be designed). Very customizable. Takes Glock mags 

It's 100% reliable with all forms of 10mm and .40 S&W that I've shot through it, though the latter at normal velocities seem to end up subsonic and tend to keyhole. [NOTE: I do not recommend shooting .40 S&W out of your Glocks or MechTechs that are chambered in 10mm. At your own risk, etc.]

I have the Telestock and Quad Rail version, and the following accoutrements:
Magpul Angled Fore-grip on the bottom rail
Crimson Trace green laser on the bottom rail at the front
Holosun HS503GU green dot on a UTG skeletonized mid-height riser
Magpul two-point/single-point sling with rail mounted attachment points
Magpul polymer BUIS front and rear
Dale Fricke Zaccaeus trigger guard holster

The weight comes in at 8lbs 3.6oz with an empty G20 mag inserted (without the sling attached).

I also have a couple of mags with Arredondo +5 mag extentions.

The redundancy in sights and lasers is probably slightly excessive, but it's fun to change up which one I use in range sessions.

The price for the uppers have gone up in the last few years. I payed almost $200 less than the current MSRP. Knowing what I know now, I'd buy one without hesitation.

If you have any specific questions about it, feel free to ask.

Thanks Keiichi for the great info!

Ken