"What do you think of the Spektrum line..."
Now that's a real can of worms. Rather than offer an opinion here, I'll refer you to the search tool. Take your pick of radio brands and do a search for them. Add in terms like "Spektrum problem" or "Futaba lockout" or "Hitec loss of control." Obviously, people don't generally make threads about their radios when everything is working fine, so trouble threads will give you a more negative view of a brand than the hobby as a whole has seen. But they do give you a feel for what the recurring issues are and how often they happen.