Is this prebuilt pc worth it?

Most of this prebuild type pc-s are not worth your money. Manufacturer always use the cheapest hardware possible. It more likely will be chineese noname gtx750ti aswell oem chineese mobo, stock amd(sometimes even worse) cooling. It's defenately not a good idea to buy prebuild system.
 
PCPartPicker part list / Price breakdown by merchant

CPU: Intel Core i3-6100 3.7GHz Dual-Core Processor (£98.99 @ Novatech)
Motherboard: MSI H110M Pro-VD Micro ATX LGA1151 Motherboard (£45.44 @ CCL Computers)
Memory: Kingston HyperX Fury Black 8GB (2 x 4GB) DDR4-2133 Memory (£29.99 @ Amazon UK)
Storage: Western Digital Caviar Blue 1TB 3.5" 7200RPM Internal Hard Drive (£41.99 @ Ebuyer)
Video Card: MSI GeForce GTX 750 Ti 2GB Video Card (£89.99 @ Novatech)
Case: Thermaltake Versa H22 ATX Mid Tower Case (£25.11 @ CCL Computers)
Power Supply: Antec TruePower Classic 550W 80+ Gold Certified ATX Power Supply (£54.15 @ BT Shop)
Total: £385.66
Prices include shipping, taxes, and discounts when available
Generated by PCPartPicker 2016-07-22 11:35 BST+0100

This has a much better processor, DDR4 ram, (probably better brand than the prebuilt)It has a better case, probably a much better power supply and possibly better brand HDD. This will also allow you to upgarde to much powerful skylake processors in the future unlike the AMD build.
 
Solution


This system is far more powerfull then the prebuilt system you proposed.
 


I did not say fake, it's called oem (Original Equipment Manufacturer) This chineese built parts are mostly made out of the same components as branded hardware, but you don't get guarantee that your hardware will serve you long because of poor quality control of this oem branded manfacturer. Many prebuild pcs use them, even branded ones, like lenovo or hp.