I couldn't find a coverage map on Openmobile's website. Do they provide coverage in the interior portion of the island where Sprint does not?
The spectrum situation certainly looks much better for Sprint (in PR) with this purchase. If they where really aggressive and decided to run a minimal number of CDMA (2 probably) they could run two 10x10 Band 25 LTE carriers. Hopefully they keep the 700 MHz license as well, it would be beneficial for several reasons: The initial transition for existing Openmobile customers, the roaming revenue from Verizon customers visiting the Island, it provides another 10x10 LTE carrier for capacity, and it solves the low band problem that Sprint has in this market (although it would be unavailable to most (or all) of Sprint's current customers initially).