While you don't receive a credit score from all three credit bureaus, you do receive a full credit report.
RentSpree's reports come from TransUnion SmartMove, which includes a Resident Score. This score is more precise than a traditional credit score. TransUnion SmartMove analyzes the credit report and produces a score between 350-850. While a traditional credit report only analyzes loans, the TransUnion SmartMove report analyzes rental performance as well. This includes things such as level of delinquency on the account, length of time the accounts have been established, and how many accounts have been established.