Its worth it for extra performance numbers and as its the same price it is a no-brainer.
Well after a error with the web page last night my order didn't process but its been re ordered today with the new SSD in like you suggested. Heres what I got..
Samsung PM961 Polaris 256GB M.2-2880 PCI-e 3.0 x 4 NVMe Solid State Drive HD-22D-SA
Seagate 1TB 7200RPM SATA 6Gb/s 64MB Cache HDD - OEM (ST1000DM003) HD-334-SE
GeForce GTX 1070 "Founders Edition" 8192MB GDDR5 PCI-Express Graphics Card (GV-N1070D5-8GD-GX-186-GI
FREE WITH GX-186-GI: NVIDIA Promotion: Paragon $115 of in-game value!
XX-033-NV
FREE WITH GX-186-GI: Gigabyte G750H 80+ Gold 750W Modular Power Supply CA-03A-GI
Corsair Carbide 400C Midi Tower Gaming Case - Black Window (CC-9011081-WW) CA-216-CS
Corsair Dominator Platinum 16GB (2x8GB) DDR4 PC4-25600C16 3200MHz Dual Channel Kit (CMD16GX4M2B3200C MY-468-CS
Gigabyte Z170X Gaming 7 - Skylake Core i7 6700K CPU & Motherboard Bundle **£20 Saving** BU-022-GI
Microsoft Windows 10 32/64-Bit - USB Pen Drive - Retail (KW9-00017)
SW-174-MS
Corsair Hydro H110i GT 280mm Extreme Performance Liquid CPU Cooler (CW-9060019-WW) HS-030-CS