I must have done 30+ brews on my Grainfather. Not had a single problem. Yes, there are definitely cheaper solutions out there but if you want a Grainfather, from my experience reliability is not a reason to buy elsewhere.
I don't buy the argument about 'tech means you don't get to learn much about brewing and recipes because it's done for you' - I could easily switch to a completely analogue system and have absolutely no problems brewing a great beer. You still need to understand basic concepts for determining water volumes, grain quantities, mash temperatures, etc. to create your own recipe. Obviously, you can also take a ready-made recipe for the GrainFather, which may be beneficial for beginners who feel they have a steep learning curve.
At the end of the day, there are different solutions that may be right for different people. Some people may want the simplicity of not having to build up their brew kit from cool boxes, etc. Others might quite enjoy that challenge.