From what I can tell, the eye relief is pretty close to 3 inches on the 10x setting. I measured it at 2 1/2 to 2 3/4 inches to the front of my shooting glasses and, of course, there's another 1/2 an inch to the eye.
When I was testing the non-IR version on my .338, I had the scope contact my glasses twice in 60 rounds, when I drew in a bit too close (shooting off the bench). The contact was just a "touch", basically enough to be aware that the scope had made contact in recoil.
Anyone looking at these scopes should be aware that they are a relatively inexpensive scope that happens to have very clear glass and what appears to be pretty repeatable settings. I've bought several of these for friends and have mounted several on light-recoiling centerfire .22's, basically for the gopher patch. The longest distance gopher I've shot using one of these (so far) was a laser-rangefinder confirmed 252 yards. Dial in, whack.
What I didn't post above was the 300 yard target I shot with my Tikka Tactical, using an older (1980's vintage) Leupold 10x "silhouette" scope. The long and the short of it is that the group size is pretty well identical, but the clone is easier to adjust for varying ranges. I'd say I prefer the Leupold's extra-fine cross hairs and it may well have a bit better resolution, but you'd be hard pressed to tell the difference if you didn't know what you were looking through.
So, bottom line is: you could easily spend three or four hundred dollars and get a scope that isn't as good as these knock-offs. I can't say anything about how tough they are, since I haven't abused any of mine (except for putting 60 rounds of .338 through the one).