He is Indeed. A good friend of mine, we've made various deals, had no issues at all. Moreover, he is a moderator in one popular Lithuanian RuneScape blackmarket.
In Conclusion, this guy is very trusted, you can definately trade with him without any risk, good luck.
Because your thread title says "Pin Store" and not "Upgrade Store" your thread may be closed and you may haft to make a new thread; good luck with the upgrade service too though.