I am currently training in a Mooney, and I am having no issues with it. I would suggest getting an instructor with lots of time instead of a low time instructor. My instructor didn’t have a lot of Mooney time, but he had 3500 hrs of instructing, and over 6000 hrs TT in small planes, so basically he can fly anything. Also, a high time instructor, can let you mess up without exceeding his limitations and damaging the airplane. I know for a fact, on several occasions, that if I would have went with a low time instructor, in a complex retract, something really bad would have happened, but instead he is very skilled, and lets me mess up so I can learn from it. A low time instructor would take over before you messed up, therefore you wouldn’t really learn anything from it.
Needless to say, it didn’t work out between my high time instructor, and I need to finish my PPL. I have a new instructor with low time, but now I am at the point to where that doesn’t even matter, because I am now confident, and comfortable with the plane, and I have the experience to know if something doesn’t feel right to do a go around, and I can execute that in a split second.
My opinion, is that any airplane, is a good airplane to learn in, as long as you take your time, and put safety 1st, and it makes sense to learn in the plane you intent to purchase.
Once again, the above is just my opinion, from my experience, and there are more guys on here, with more experience that will total disagree with my advice, and they can be right. So just listen to what they have to say, think it through logically, and determine what’s best for you. Whatever their opinion is, they are right, because that’s what works for them.