Thanks for your help... but I'm still having problems...
To give you more details... I have changed some of my flats when I'm stuck out somewhere... the dealer I bought from changes them when it's possible, so there won't be any excuse to blame me for improper tube installation, even though it isn't very difficult if you go step by step.

They installed cloth rip strips on both bikes and we took them out this weekend. Saturday I rode around for a couple hours, no problem. I got home and checked tired again before going to bed. In the morning it was flat. I took out the tube and it was approx. 1/4" tear in the tube, facing the center of the rim. I measured the tear from the stem and it is exactly at a point where the spoke connects through the rim. AND I could already see another worn spot on the tube in the exact area of the next adjacent spoke/screw.

So, I changed the flat, marked the spot where it tore and rode Sunday for 2 hours, came home and everything was OK. I was sitting up doing some work late at night and heard it suddenly releasing massive air, bursting in the hallway. I took out the tube and it is at the exact same spot as the first and again, same size tear.

This makes the 3rd front tire tube on my bike that's blown in the 2 months I've had it. I've had 3 blow in the rear. 6 just on my bike in approx. 12 trips out. I always inflate to the standard pressure before going out. I had a cheap $70 bike from Academy that I never checked inflation every trip out and rode through woods, gravel, etc. with never a problem. My girlfriend had a road bike that she would even go off road sometimes without a single flat in over 10 years!

If you look at any company who tests their product and it fails 50% of the time - it would be considered a defective product. I took the rim and tubes to another dealer and he was stumped, saying usually one rim strip should fix the problem but I could try two strips or look into warranty issues for defective rims. Every tear I've had is either on the edge of the rim side or center on rim side, never on the tire side. It is never a two hole puncture but a small gash.

I've been looking into the tubes and even though they are not the best rated ones out there - both dealers in my area carry them as their main stock tube - the same ones that GIANT sells - Kenda. GIANT dealer here seems to think it isn't a tube problem but something with the rim. I'm hoping they will not give me too much hassle in replacing the rims, if that's the problem here. I've had bikes since I was a kid and never had a tire problem of this nature. I just started riding mountain bikes less than a year ago and my main reason for contacting experienced riders on this forum was to see if this was common in mountain bikes or anyone owning a scott aspect 2010???

Out of the six tubes I've had blow - I changed two of them on the road. All I wanted was a bike I could rely on. It is really depressing having to do this over and over again. I did fork over cash for the first few blown tubes we've had. The dealer is trying to help me get to the root of the problem and installed free rim strips and free tubes. I'll post whatever results I end up with. I hope it isn't an ad for anyone interested in a new bike! HAHA!