Here's the backstory. My 18-year-old son just completed Basic Training, which is the first phase of his year-long adventure with the International ALERT Academy (alertacademy.com). It was an extremely rigorous nine weeks, part of which includes about 200 miles of hiking with full backpack loads -- culminating in a 50-mile, continuous 24-hour hike in the Winding Stair Mountain National Recreation Area, Oklahoma. Those guys were really moving! And it wasn't all touristy trail stuff either. They finished in 23 hours, 15 minutes by the way.
Anyway, point is that he wore his Merrell Chameleons, and had fewer foot complaints than virtually any of the other 42 guys in his unit. So, when he got home for his four weeks furlough, he insisted I buy myself a pair of Merrell trail hikers. Only problem was, his model had just been outdated, and replaced by the Continuums. I tried them on at Cabellas, and found them to fit like a part of my foot. (Caveat -- It took a full-size larger than normal to get that good fit. Don't know why. I'm a 10 1/2, and had to take a Merrell 11 1/2. Note to myself: Don't ever order shoes over the Internet.)
Couple of questions:
I argued with my son about the boot vs. shoe issue for backpacking. He basically said that he gave his shoes the extreme test and came back with flying colors. He said others in his unit who wore boots mostly all regretted it. They developed blisters and other foot complaints. He didn't.
I'm worried about the lack of ankle support. I've been wearing these shoes extensively around our property (we live in the mountains), and elsewhere. And, I've been on a couple of practice day hikes around Yosemite Valley. They seem to do OK so far. But, what about getting off onto some high-country trails, scrambling over rocks, etc.?
These really are cool shoes. You only have to lace them up once. The laces are like little bungies. They stay put, and you put the shoes on and and take them off like slip-ons. This worked great for my son because the unit would get scrambled in the middle of the night for a night hike and they were given only seconds to be ready. I like that feature because I don't like the tedium of tying laces.

Second question is I'm wondering if anybody else has these Merrell Continuums, and has had a problem with the back of the shoe where it contacts the Achilles tendon. My son's shoe has a little cutout there that accommodates his Achilles tendon. In Merrell's wisdom, they eliminated that feature in the new model, and there is a constant pressure against my Achilles tendon. So far, with constant wearing, and a couple of short hikes, I haven't developed a blister there ... but the pressure against my Achilles tendon just plain feels uncomfortable. Has anybody experienced this? And, if so, what have you done about it?
I'm planning a busy backpacking summer and fall, so the questions are not just academic.
Sorry for the long-winded post. I'm a writer. I get wordy.

Thanks,
Dave