Does this have a milk frother for lattes or cappuccinos?
No. This stone-coloured PB041 has no milk frother or milk-based drink function, and the frother comes only on other versions of the machine. This is a single-serve drip coffee maker that brews from pods or grounds, not a coffeehouse-style espresso and milk system. If frothing is important to you, you'll need a separate frother or the frother version.
How worried should I be about durability?
Durability is the machine's weakest point, a real and meaningful concern rather than a rare complaint. The faults include leaks around the pod lid, often avoided by pressing the pod down firmly before closing it, and a pod adapter that stops being recognised if its small magnet comes loose. A 1-year limited warranty is included; register the machine promptly and use the warranty if a fault develops within that window.
Can I use both K-Cup pods and my own ground coffee in the same machine?
Yes. Ninja includes a pod adapter and a removable brew basket to switch between K-Cup pods and loose grounds, and there is built-in storage for the parts you're not using. That versatility is one of its strengths, and it lets you choose convenience or your preferred grounds on a given day.
Is the coffee actually hot, or lukewarm like some single-serve machines?
Coffee temperature is generally good, and it can be a clear improvement on a machine that brewed lukewarm, with steam visible from the first plain-water cycle. It can still come out not quite hot enough, and the temperature can't be adjusted; letting the machine sit a few minutes, or running a 6-ounce cycle of plain water first, can help.
How big of a cup or mug can it brew into?
Up to 24 ounces for grounds brews, specifically sized to accommodate a standard travel mug rather than just a small cup. Grounds brews come in 6, 8, 10, 12, 18 and 24 ounces, and pod brews range from 6 to 12 ounces. This range covers everything from a small cup to a full travel-size coffee.
Is it worth it given the durability concerns?
Value is mixed, which tracks with the durability concern: a unit that performs reliably is good value given the genuine pod-and-grounds flexibility and strong coffee quality, while one that hits an early fault understandably isn't. The case is reasonably strong provided you register for the warranty and test thoroughly within the return window.