Exercise bikes really blast your cardio and are good for your heart! They're a great purchase for personal health especially if you can't go outside due to allergies or other restrictions. They don't take up alot of room, as well! 
Yes even more during when you don't want to go out, using it at home is convenient and gets you to sweat without needing to leave the house when you don't feel like it!
It's something convenient for beginners in working out too, since it's relatively simple. Just because it's simple doesn't mean it isn't challenging though. It's used in physical therapy clinics too because of it's muscular benefits! It's really a killer.
Definitely is. The first few uses your legs will burn like heck. It takes a while for your body to adjust but once it does it becomes easier and its just a great all around way to workout. Physical therapy always uses these bikes too, I can see why!
A more recent development with these exercise bikes are their ability to produce electricity, as well! Someone who works out regularly can make about one hundred watts of continuous output if you just keep pedaling. Almost like a human waterwheel. I suppose the next thing will be charging your phone while you exercise!
Wow that is amazing! They also improve the function of your lungs and heart. If you use them regularly it strengthens both and improves the ability of your body to utilize oxygen efficiently. They can also decrease blood pressure
They would be really beneficial to someone with asthma or lung function difficulties after pneumonia or bronchitis. It's hard and painful to start working on lung issues like capacity, for example, but it has to be done, and you're definitely right about the exercise bike putting strain on your lungs. 
Yes definitely I agree with you on everything. They are also great for reducing the risk of type 2 diabetes and they just make you feel good overall
Thirty to sixty minutes of cycling a day can bring about those benefits concerning diabetes... That's a long workout! I'm sure that an exercise bike would be great for a stay-at-home mom then too, especially if you don't want to leave your baby for the gym or even running around the neighborhood
Yes, even a small twenty minute cycle ride is enough to stay healthy and drop around 19.2 percent in blood glucose levels.