I just recently picked up some of the ultralight version of the Vargo nail pegs (8 grams each) at an outfitter recently, and I'm actually pretty impressed with them. Make no mistake - they are not the beefy awesome bigger version that I love best (14 grams each), but they are almost as light as a shepherd hook stake, and work much better, since the guyline is held down against the ground rather than up on the hook. The diameter is a little thicker on these than the shepherd hook pegs too - 4mm versus 3.2mm, which is a small difference but makes them significantly stronger and helps them hold the ground better. Different brands/products of titanium shepherd hook pegs have various diameters generally between 3.0mm and 3.5mm - the Toaks ones I have are 3.2mm. For comparison, the heavier 14g nail pegs have a 5mm diameter. The eyelet on these seems to be the weak point, so I use more caution with hammering/pressing them into the ground than the bigger/heavier ones, and don't don't hammer them in too far to the stress from the tent/guyline is on a point below the eyelet, but so far so good. I also found that when the ground is really hard, using a single heavier nail peg and hammering it in maybe 2/3 of the way, then pulling it out and using that as a starter hole for a lighter weight nail peg, works great and does not subject the lighter weight peg to as much stress. I only bought a 6-pack but am pleased enough with them that I plan to purchase more of them, and then switch to them as my primary peg to reduce my weight, carrying only a couple of the heavier nail pegs along for starting holes in hard ground and for the two most essential pegs on my tent. For winter use, I'll still fall back on using all heavier nail pegs.
The shepherd hook pegs will be sold soon, along with most of the V-pegs I have.