[Ajoka]

Hi I am new in X cart wish to get some help on XCart Modules hope you will be enough kind to help me.
I already installed 10 XCart Modules from X-cart.com but i found some very nice XCart Modules from magneticone.com and also wish to install them with my xcart shopping cart.
Does any one have experience this this company? are there Modules are stable for XCart ?
I hope after instalation my shop will not distroy totally JUST AFRAID.
If i add a lot of Modules do you think mysystem will become very slow????