Oracle's US$5.85 billion acquisition of Siebel is set to close Tuesday following a vote by Siebel shareholders. The two companies agreed to the deal in September.

To date, the disposition of Siebel products and technologies, such as its Business Analytics tools and the OnDemand hosted CRM offering, remains unresolved.

Oracle declined to comment for this story, preferring to wait until the deal closes. However, following the move to buy Siebel, Oracle executives had expressed keen interest in some that company's offerings, including OnDemand, which is hosted on systems from Oracle rival IBM.

Despite the lack of a firm plan from Oracle executives, five Siebel users said they are still either upbeat or neutral about the deal. Most said they don't anticipate immediate benefits because they expect the integration of the companies and products to be a complex, long-term project.

'I think this integration is going to take a while,' said Mike Thyken, CIO at Select Comfort Corp., a Minneapolis-based mattress retailer that runs the Oracle E-Busines Suite 11i and is installing Siebel's analytics application.