Try to obtain an evaluation copy of the software and put it through your paces. It is highly recommended that you check out and confirm each functionality requirement with test data specifically pertaining to your company. Evaluate the Manufacturer and Reseller. It is important to choose a stable company that is going to support the product and is committed to enhancing their accounting package on a regular basis. Plan the implementation carefully.
Any software installation can be frustrating.
Careful planning as to what happens when and who is responsible for what is critical. Your VAR partner can be extremely helpful here. Most implementation failures are the result of inadequate planning, lack of resolve in management to really get the job done, and lack of adequate resources, both financial and personnel, being allocated to the job. Good planning will result in a good implementation and happy end users. It's well worth the time and the cost.