I assume that the OP has probably taken his PAL / RPAL course already so I'll just post this for others looking for reviews of Ready Aim in Oakville.
My girlfriend and I took the course in November of this year (22 & 23). Lucky for us, our instructor happened to be the owner (Anthony Cooper) of Ready Aim. I believe he was with the OPP for the majority of his career and had a lot of experience with firearms in general. He's also quite the hunter and could relate a lot of the material he was teaching to hunting.
We definitely found the class interesting although it was a pretty long day. (8:30AM till 5:30PM...add in the written and practical testing and you could be out by 8PM)
Our classes were kept fairly small (12 to 13) so there was a lot of time to get one on one instruction. He also had enough firearms that all of us got more than enough handling time.
We just received our test results in the mail a few days ago.
Overall, we'd highly recommend Ready Aim in Oakville (although it's pretty much on the border of Mississauga)
Don't worry about parking as there's more than enough spots.
Food wise..we pretty much ate at the Wendy's/Tim Hortons for both days since it was only about a 2 minute drive from Ready Aim.
Good luck