It's really hard to say a bad thing about the school itself. The instructors are professional and always willing to help. The ground school, well, it depends. It's always one-to-one, which is good because you can ask as many questions as you want, but on the other hand I find it easier to focus on the subject in the classroom environment. You pay for every hour of the ground school, so the better you prepare at home, the cheaper it's going to be.
Airplanes are quite old but maintenance keeps them in good condition. From time to time you'll find that something is broken or not working, but no one is going to say a bad word if you report it - actually you should always report it (and you won't get charged if you already started the engine). If there's another airplane available you'll get it. Most of the airplanes have the same avionics and everything installed usually works.
Students are scheduled by the scheduler 2-3 days in advance. Typically you'll get a 2-hr block every day, of course if you need more time to do the cross country then you'll get more. C172s are less busy so if you want to just fly somewhere for pleasure (or time building) one of them is usually available during the day. C152s are crazy busy during daytime but it's easy to schedule an extra flight in the evening/night.
People are nice but most of the non-Chinese students are flying helicopters, so you might feel it's a little more difficult to make friends if you're a fixed-wing guy, at least at the beginning.
Becoming a CFI. Every month they hire 1 or 2 instructors. Most of the fixed-wing students are on the airline contracts so they just finish their commercial training and go home. Only a few domestic, European or Japanese students stay to work as CFIs. However, the employment is not guaranteed. Being on F-1 visa means you can work at any flight school in the US and doing your training at Hillsboro Aviation allows you to work for 2 years.
Lastly, the WEATHER. Well… for the bigger part of the year (October-May) it's mostly crappy. Rain, low ceilings, low freezing level. Once you complete your private and start working on the instrument weather won't be such a big issue but prepare for the winter when there are some weeks you'll have to cancel your flights on 4 out of 6 days. On the other hand I have some friends who went through PEA and their training wasn't really faster than mine.
