I remember reading an interview in the british music press in the 70's with Ry Cooder. The interviewer was asking him about his gear and on slides he said he preferred heavy walled glass and his favourite was from the neck of a specific year of Mateus Rose, oh and you had to have the weld on the string. A few years back I read another Ry Cooder interview reflecting on his career where he laughed at how he would tell various interviewers any old thing and then get a kick out players reactions and mentioned one in which a quote on Mateus Rose had caused a spike in sales. That was probably a spoof as well, the point being that you should play with what you have and makes you happy. If you think a diamond studded titanium slide makes you sound better then go for it just remember it is likely all in your imagination.