I don't have a huge experience, but riding for a year and a half on matrix lites mostly on sand and they were knackered. Needed so many replacements you could have bought two sets of skates! If you are mainly grass then this probably won't be an issue.
If you really want matrix the lites aren't really worth the extra for a few drilled bits IMHO (80grams each, whoo hoo!). I have swapped to Vectors, like them a lot, but only had two sessions on them so far.