Tiagra 4700 Hydraulic Groupset

I am thinking of putting a gravel(ish) bike together.  I mainly ride on road but would like to have hydraulic disc brakes and lots of clearance for wide tires and get full mudguards on in case I fancy riding in the wet.

Hydraulic groupsets all seem expensive, often almost double the cost of the rim brake groupsets, but the new Tiagra Hydraulic groupset seems quite reasonable at 400€ (105 costs 550€ and ultegra 780€)

Does anyone have any experience with it?  Is it much heavier than the 105 groupset?

The weight difference is less than 100 g if I recall correctly.

Pro: 4700 STI levers are the same feel as Ultegra/Dura-Ace; some prefer this over 105.
Con: (probably negligible) 4700's rear derailleur is incompatible with all other Shimano road groups; it has slightly different wire travel.

Xiatian wrote:The weight difference is less than 100 g if I recall correctly.

Pro: 4700 STI levers are the same feel as Ultegra/Dura-Ace; some prefer this over 105.
Con: (probably negligible) 4700's rear derailleur is incompatible with all other Shimano road groups; it has slightly different wire travel.

\n \nWife has a 4700 RD and 4600 shifters. They're 84% compatible in that 8 of the 10 gears work really well and one kinda works and one doesn't at all.