I have just changed the Giant S-R2 /Shimano hubbed wheels on my 2011 Defy 2. Without cassette, tyres or skewers the rear weighs 1150g and the front 914g.
I bought the Mavic/Shimano 105 wheels advertised on here which feel like lovely quality. The weights are 1057g rear and 845g front, so I've only saved 162g.
But they feel really good !
OP - I'd encourage you to think about changing.
I did notice the difference on my ride into work this morning - first one with the new wheels. 105 hubs much smoother and I set a new PR on an uphill section. The bike felt faster and the stats show that it was.
I do like the look of the PSL-1 wheelset & it might be worthwhile looking at those. Otherwise I can recommend from experience, Mavic CXP-33s on Shimano 105 hubs with Sapim spokes.
I do now need to wash the bike though after muddy roads took their toll.