Any comments on the variations? Good for a smooth +=?
Mastering 4. ... dc4 in the Reti Slav

Don't like the look of it for black, too complicated for me, and would prefer 4...Bg4 but some strong players are playing it.

Don't like the look of it for black, too complicated for me, and would prefer 4...Bg4 but some strong players are playing it.“
Wait, 3. … Bf5 & 4. … Bg4?!

Looked at the variations after 4...Bg4 5Ne5 Be6 6pxp Bxp 7Nf3 c5 sometime ago and seemed fine for black. Would probably play 2...Bg4 it doesn't seem necessary to play 2...c6.
The variations after 4...pxp are a bit above my rating to understand,
Have fun & hope you‘ll find some inspiration!