This is certainly a testimony to Nokia’s quality and value perception of its products. Lumia 925 which has been launched at T-Mobile not so long back has already been reviewed by 66 buyers and is rated 4.8. Not only this 98% buyers recommend the device to others. You wanna know how competition is faring. Then Android champ SGS4 has only 88% recommendation and 4.5 rating, iPhone 5 has been rated 4.3 and is recommended by only 81% buyers.
We have seen similar ratings and recommendations at Verizon for Lumia 928 as well. In short run while these may not influence sales numbers but the word of mouth will certainly be beneficial going ahead.