habtm saving: is my really simple solution fragile? using a model for habtm-table

hi everyone,

I found this habtm saving tutorial on the net and it wont work for me:
http://bakery.cakephp.org/articles/view/add-delete-habtm-behavior

it uses both models in the relation and combines them to save or
delete data in the habtm-relation. now I had Problems with habtmAdd
and habtmDelete. some weird things happen...

So instead i did it my own way and created a model for my habtm-
relation:

class ProductsCategories extends AppModel
{

var $name = ProductsCategories';
var $useTable = 'products_categories';

}

so everytime a user hits the "save" button to save a relation i do
this really simple code using my newly created model

$this->data['ProductsCategories']['user_id']= $user_id;
$this->data['ProductsCategories']['product_id']= $pr_id;
$this->data['ProductsCategories']['visible']= "-1";
$saved = $this->ProductsCategories->save($this->data);

... instead of the more complex one from the tutorial. and it seems to
work. now the big question..

What is wrong with my code? I am using 1.3. is this not stable?
insecure?`will my pc explode? ;)
I dont trust my "skills" here.....it just seems too easy...

i am really curios here :) thanks a lot

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