I put EP Weichs on my bass in June 2009 and they still sounded and felt great three years later!
By way of background, Ive had a love affair with Evahs since I first discovered them in September 2007, and posted an enthusiastic review of EP regulars in the Evah Pirazzi Strings Megathread Part 1, Post # 355, page 18, at this link:
http://www.talkbass.com/forum/f17/evah-pirazzi-strings-megathread-part-i-325116/index18.html
The only reason I took the regulars off after16 months, in April of 2009, was to try the EP Weichs. Once again, I was dazzled by how great these EPs sounded and felt (big fundamental, evenness across the strings, woody, organic, stiff yet supple under the right hand). I posted another enthusiastic review of the Weichs in the Evah Pirazzi Strings Megathread Part II, Post # 291, page 15, at this link:
http://www.talkbass.com/forum/f17/evah-pirazzi-strings-megathread-part-ii-543119/index15.html
In mid-April of this year, after three years, the EP Weich magic still seemed to be working. The strings had acquired a burnished tone quality, and still sounded warm and compact. The growl was still there on the E, as was the click in front of the notes. The string set was still balanced, and played evenly across. The only difference I noted was that the overtones around the fundamental seemed to have diminished. As a result the notes sound somewhat flatter (in dimension, not pitch), as if something in the strings had stretched over the three years and reduced their range of oscillation. Because this effect appeared in all the strings to the same degree, it wasnt objectionable except in notes in the thumb position on the G string, where the string seemed unable to resonate, unable to produce a clear note.
It was this last change that led me to want to try a new set of EP Weichs. Adrian Mueller at Pirastro, who had been kind enough to let me try out both gauges of EPs, graciously sent a new set of Weichs. They went on in mid-April and have now had a chance to settle in for eight weeks. And wow! If three-year old EP Weichs were still wonderful, new ones are out-of-the-park georgeous. Big, fat, blossoming notes, with lots of head room, a term usually applied to amplification but one that seems awfully appropriate here. The overtones surrounding the strong and distinct fundamental in the new strings may be responsible for this quality, but whatever its source the strings feel alive and ebullient, warm, organic and woody.
Ive said it before and Im happy to say it again: Pirastro has created something wonderful in these strings. When I play them Im happy and dont want to stop, like the slogan says. Congratulations, Pirastro!