Targus ACP71USZ USB 3.0 SuperSpeed Dual Video Docking Station with Power

Pros: fairly priced for the feature set
lots of features
makes your laptop power supply into a spare power supply
works as advertised

Cons: none

Other Thoughts: If you would benefit from 2 additional video ports (1 hdmi/dvi & 1 dvi/vga), 2 USB 3.0 ports & 4 USB 2.0 ports, an Ethernet LAN jack, mike & speaker/headphone jacks, a spare power supply for your laptop, & the ability to consolidate all the cables to your laptop into 2 (1 power & 1 USB 3.0), then this is DEFINITELY a good choice for you. While not cheap, it is quality-made, & costs less than the alternatives providing the same capability. I'm happy with it, & would buy it all over again.

Pros: good device, does what it says it will do flawlessly.

Cons: a bit pricey, but worth it for the features & quality

Other Thoughts: NOTE:
It has one video port that can be either DVI or VGA; the other video port must be HDMI or DVI (won't run a VGA).
It will NOT work in conjunction with other video port adapters (such as the USB2VGAE2 also sold by Newegg).
The ability to power your laptop from it means your existing laptop power supply becomes a spare (or use the existing one when travelling).
The 2 USB 3.0 ports & 4 USB 2.0 ports mean that you can probably do without any other USB hubs.
You can plug headphones or speakers into the dock, a microphone, & a LAN cable for Internet/printers/NAS backup storage/etc. This means you sharply reduce the number of cables into your laptop (power cable from dock, USB 3.0 cable from dock, & possibly a VGA/HDMI cable from a 4th display if needed).
It's a great device to add functionality to you laptop, reduce the cable clutter, & make it easy to detach the laptop from all the peripheral devices, to take the laptop with you somewhere else.

Pros: quality, easy to install & use, does what it claims, reduces the cable clutter around your laptop (or desktop).

Cons: slightly expensive, but a good quality product by a reliable manufacturer, so bite the bullet & get one if you want/need additional connectivity.

Other Thoughts: This product is from a distinguished provider of mobility accessories. It is high quality, & reliable. I wish it was a bit less expensive, but then you only get what you pay for, & I want quality products, so . . .
If you are connecting this dock to a laptop, they usually have a vga & a hdmi connector for a 2nd display (& sometimes a 3rd one on the newer high-end laptops), so you could have a total of 4 (& sometimes 5) displays on your laptop.
Desktops may have either a single-display video card, or a dual-display one, so the total becomes 3 or 4 displays there.
If the above is not enough for you, then you can also add one or more of the "StarTech USB2VGAE3 USB to VGA External Video Card Multi Monitor Adapter – 1920x1200".

Pros: Works well for machines with USB3.0 and provides the functionality expected. There is a key 'issue' with the network which as a bit of a headache to workaround for em with my 100M Cat5 wired home.

Cons: Network is a Gigabit connector. All of my machines with Gigabit adaptors in my home (11) have no issues functioning on my Cat5 100Mbit infrastructure. This dock would not reliably (it works at initial power up, then stops). It should be able to work on 10MB, 100MB or 1GBT. You can't tweak it down in settings.

WORKAROUND: connect my home network into a Gigabit desktop switch. Connect the dock to this switch with Cat5e or Cat6 cable. From then on, have not had issues.

Other Thoughts: Overall, I do like this solution. The networking issues has been a problem for a lot of people so I wanted to share the workaround I found.

Pros: Great universal docking station. Have been using it for work (daily laptop removal) with dual 22" monitors and no issues so far after >6 months. Easy connection, just 2 cables (USB and power). Great unit. Extremely happy with it. Using with HP Pavillion dm4 running Win7 Home (upgraded RAM to 16 GB). Awesome laptop as well.

Cons: NONE whatsoever.