We do not guarantee percentage of indexing as it is impossible to do so since it depends of numerous factors.
Since end of last year it is known that G has a bit of indexing problems. They have also announced that and confirmed indexing issues. However, across IM forums it is known that bug stil persists due to crawling rates and priorities for "authority" sites that are being crawled, since keeping less "spend" for smaller websites.
This is why it is also important to keep your pages (that you would like to index at least) neat and in a "good shape" for indexing as well.
We guarantee 100% that google spiders will visit URLs that you have set to be submitted. Even we do not make such claims, our indexing rate is very high.