If you MUST use 'satisfied', then rearrange the sentence.

Customers have been satisfied with two major elements, namely the benefits and eas of our sales tool.

or

Customers have been satisfied with the benefits and eas of our sales tool.

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Note added at 2003-07-07 16:50:35 (GMT)
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have to train my middle finger:


EASE, ease, EASE, ease

In your example, you could write "Two major elements which our customers have been (particularly) satisfied with are..."

You could write "...with which our customers have been satisfied...", but many native speakers would find this rather formal and old-fashioned.


You might want to use a word like "aspects" or "features" rather than "elements", and use something like "pleased with" rather than "satisfied" - or re-write the sentence, e.g.: "Two features of the product which (many) customers have found particularly impressive are its ease of use and the advantages/benefits it offers"....
HTH

... have been X & Y.

Or,

The two major elements of satisfaction for our customers have been X & Y.


Good luck

Elena

Use of the adjective "satisfactory" eliminates the need to agonize about the placement of the preposition "with".
Another option would be to say
Two major elements, which contribute to customer satisfaction...........

Hope this helps!

There are a few things to consider;

"Sales tool" is awkward. Are they discussing their website? order page? better to be more specific, if possible.

also: benefits of a sales tool - what exactly does that mean?

Common structure for this type of phrase:
I am satisfied with (the service).