I have a work-provided Surface Pro 3 i5 256GB.
I love it as my travel computer. I did try run it with 3 external monitors and as my main 'in-office' computer and that did not go well. (At first used the Display port on the dock and daisy chained 3x Dell U2414H, this was temperamental. Then tried with an EVGA USB3 external graphics dongle. That went better, but still badly.)
Now I run a seperate in-office computer to run the 3 monitors, and have the surface as a 2nd PC. (Mouse without borders rocks for this kind of setup)
Through work have played with Surface 4 Pro and Surface Book, and I love the Surface 4 Pro too.
Cant say the same about Surface book. Dont like it at all. And esp. not at the price point its at.
For the Surface 3 Pro I would recommend the Surface 4 Pro Fingerprint keyboard. Has a much nicer track pad than the Surface 3Pro keyboard, and also nicer keys for typing. (+ the Fingerprint login is nice)
The Surface Arc mouse is very nice too.
Thats kinda the only 'problem' with the surface stuff. You gota buy the Keyboard for another £100~, which does put it close to £1000. Can get a regular laptop for less.
Also needed to add a Dell DA100 to make the Surface more flexible. This thing adds a Gigabit Network port, HDMI, VGA and another USB 2.0 Port.
Main: | Win 10 Pro | i7- 4790k | 16GB Corsair Vengeance | MSI Z97M Gaming | MSI GTX970 4GB | Silverstone TJ08E | Samsung EVO850 Pro 1TB | Corsair H75 | Corsair RM650 | Corsair K70 w/MX Brown | Corsair M65 | Logitech Z5500 Speakers | Dell U2715H |
Second: | Win 10 Pro | C2Q Q9550 @ 3.4 | 8GB OCZ Reaper | 2x Sapphire HD5850 1GB in CFX | ASUS P5Q-E | Creative X-Fi | Samsung 256GB SSD | Corsair HX750 |
Media: | Win 10 Pro | C2Q Q6600 | 4GB Corsair Dominator | Gainward GTS250 512MB | Intel DP35DP | Samsung SSD 128GB | ASUS Xonar D2 | PC Power & Cooling 610W | Antec Veris | Onyko TX-NR515 + Tanoy SFX5.1 | Samsung UE48H6400 |
Server: | Win 8.1 Pro N | i5 - 4430 | 16GB Corsair XMS3 | Gigabyte Z87-HD3 | Corsair RM550 | Intel 530 120GB | Corsair Neutron 256GB | 2x 2TB WD RED (RAID1) | Samsung F4 2TB (Backups) |