Actually according to edmunds, the reliability of the SRX is quite good, esp. that of the V6 models. The SRX has been on Car and Driver's 5-best Trucks list the past four years, beating out vehicles like the Land Rover LR3 and Mercedes-Benz ML500.
The base model is available with the same 255HP 3.6L DOHC V6 from the CTS, and is also matched to the same 5-speed automatic. The V8 models use the same V8 engine from the STS, which is a 4.6L DOHC Northstar which produces 320HP.
All of the models can come with RWD or AWD, and with the V8 models, there is an optional sport suspension available.
Fuel mileage for the two are about 16/22-ish, so pretty good for a mid-size Luxury SUV.