I know there already is a thread about mamba tennis strings and Discho strings, but has anybody tried this string before? I like rpm blast but am looking for a very cheap alternative since money is tight right now. Is the black mamba string good? is black mamba gear twisted much better for an extra $5 a reel? which of the strings should i buy? does ray from mamba tennis send out sample strings for people to try so that they can choose which string they want to buy as a reel?