I'm ready to buy 2 of them but scared off by some of the reviews. Is this product really enterprise ready?

It depends on your definition of 'Enterprise Ready'. If you have a single static IP address at your company and no MPLS network, I say absolutely. If you're looking to NAT multiple statics, route over MPLS networks, or other 'advanced' things, I'd say look elsewhere.Background: I've been using the Unifi line for about a year now and my company (I work for a small IT firm) began testing it about four months after I began my initial testing. We've been deploying it to our small customers with networks as I describe, above. We've tested the Unifi site to site IPsec VPN tunnels but, without serious modification to json files through ssh, they will only establish tunnels between themselves (Unifi to Unifi). We haven't had any issues at all with traffic over, or routing for, those IPsec tunnels - they've been very reliable. This also hasn'tt been a problem as we run the USG Pro4, 24p PoE USW and a Unifi AP Pro at our office and Cisco Firepower stuff at the datacenter for connecting to our larger clients but I can definitely see how some folks would gripe at this.With regards to reconfiguring issues, as some folks have eluded to - I have developed a procedure that allows me to reprogram the USG with any internal network subnet/IP Scheme and any DHCP server without issue. Sure, developing the process was a bit of a pain but once I had it documented, we have had zero issues configuring the Unifi networking stuff with a default non-192.168.1.0/24 network. We've configured it for use with and without external DHCP servers, no issues whatsoever. I will say this - I've been impressed with Unifi's products, overall - on all fronts. Their build quality is top notch (their new HD wap is seriously impressive, as is their USG/networking gear) and they're constantly improving their stuff through controller/firmware updates and upgrades. The difference in their product between a year ago and now is huge.I know you can outfit an entire office (usg, usw, uap, cloud key) for about $800 which is a fraction of the cost of one Cisco firewall.

Is this fanless/quiet?

Its not quiet, but its less noisy than my Trendnet 24port POE/POE+ switch with 2 fans so its barely noticeable

May i connect two different internet connection? has the gateway load balancing?

Yes. All features and available setting available through the UniFi host controller software. Search UniFi on YouTube or reference willie Howe YouTube channel for more info.

Brand	Ubiquiti Networks
Manufacturer	Ubiquiti
Series	usg-pro-4
Colour	white
Item Height	2.7 Inches
Item Width	8.3 Inches
Product Dimensions	58.67 x 21.08 x 6.86 cm; 2.27 kg
Item model number	USG-PRO-4
RAM Size	2048 MB
Connectivity Type	Wi-Fi
Wireless Type	802.11ad
Number of Ethernet Ports	5
Voltage	240 Volts
Hardware Platform	PC
Operating System	RouterOS
Are Batteries Included	No
Included Components	Security appliance
Manufacturer	Ubiquiti
Item Weight	2 kg 270 g

Unifi Security Gateway Pro (White)

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