I have been a fan of Topo for quite some time, but this is by far my favorite Topo upper design. I think the shoe looks awesome.
Laces: The laces are a ribbed type of lace, strong and plenty of length if you need to do runners knots or double loops, but was not so long that it caused me any issues. They stayed tied during all runs
Tongue: The tongue is minimally padded with a lace loop that is typical of Topo's design language. They do not do gussets, but through half a dozen shoes by them I have never once had any issues with tongue slippage. That trend continues in the Specter 3, I just trust the design at this point.
Upper material: The engineered mesh upper is very comfortable, breathable and did an awesome job in the heat and humidity where I have struggled with some other shoes. It seemed to displace water and dry very well, never had to wash the upper to remove sweaty smells. In fact, I just smelled one while typing this and I can still smell the original factory odor after 82 miles of some gnarly temps and humidity.
Heel: The heel has some minor structure too it, but is still somewhat flexible. I had no hot spots and stayed locked in very well during my runs in all conditions
Toe Room: The shoes are anatomical design and I am a big fan of it. I had plenty of room to wiggle my toes, but never had foot slippage or felt out of control.
Fit: The shoes fit perfectly true to size in my size 12's.
Upper Positives: Breathability, design, lightness
Upper Negatives: None for me, but I have seen some others note some issues with the insoles slipping in some scenarios. Through 82 miles, I did not have any issue with that, but wanted to note this experience from other users.