I know on my road-bike a get a smidge of overlap.
On a mtb the top tube may be a little longer than on a road bike and the angles a little more laid back, but the wheel and tyre on a 29er is bigger than a 700x23.
Do 29ers suffer from toe overlap, consider also i have size 11 feet? so the small footed saying they don't experience it isn't really going to be helpful.
Not unless you're 5'1" with size 11 feet.In which case you should stay in the shire.
Demo'd a 29er and put about 7-8 hours in on it over 3 days.
I experienced toe overlap exactly once, but if you have your feet in the right position (i.e. opposite side down) it isn't a problem.
However I did experience a bit of pedal strike... 
Edit: oh size 45's...
Size 12 feet here - 19 inch Gary Fisher 29er - no toe overlap so far.
I do wear SPDs though, so this may help.
I get a smidge of toe overlap on mine - 5' 11", size 12 feet.
It's just the toeclips though; with flats or SPDs, I don't think it's be an issue. Plus, the bike was designed for drop bars, so might have a slightly shorter top tube than a 'normal' 29er.
It's a fixie too, so I don't get an much choice over where my feet are when turning tight corners, but it's never really been a problem.
43, negligible...
You can't go round corners fast enough on a 29er for it to be a problem
None here. 45 spd shoe, medium niner, 2.25 rubber.
If it happens, your feet will explode along with the wheels anyway.
Taller than you and size 11 - 12 feet here - no overlap on a ScandAL.
I did notice it once ever so slightly with my Specialized Carve 29er with size 11 feet at very slow speed negotiating my garden path with flats, since I used spds then never.
It's just the toeclips though
People still use toeclips ? 😮
Why isn't it just called toeverlap?
slainte ❓ rob
People still use toeclips ?
It's a fixie that I want to be able to ride in normal shoes.
They do look a lot like those, but without the holes.
No. rigid Kona Unit 29er. Size 43 SPDs.
