Are all grow tents built the same?

Hello Gang....
Going to jump into this hobby...
I havr a local grow shop....seem like nice guys....
I am thinking it is going to be easiest to buy a 4 x 4 grow tent.
The shop sells them for about $350
On Amazon "LEDwholesalers" sells a 4 x 4 for about $100.
Are there differences in the quality of grow tents or are they pretty standard items where ever you shop?

http://www.ledwholesalers.com/store/index.php?act=viewCat&catId=87

Thanks for the input!!!

read up dude, they are not all the same..remember zip quality really counts..imho

i have a 4x4 grow lab , a30" x 30" jardin. in all ohnesty i like the growlab better but only had 6 months so zippers are fairly new still....peace ps. my growlab was 250 or less from local shop