Hi Mario,
Method CRM will work fine with QuickBooks Enterprise Solutions 2013, if you come across any sync issues just let us know. 
- Ashur
Need more help? Ask us about Method consulting services
Ashur Shamon
Lead Solutions Specialist, Professional Services
Method Integration Inc.
www.method.me
Toll Free: 1.888.925.6238
Local and overseas: 416.847.0400
Fax: 416.640.6027
E-mail: a.shamon@method.me