So much for the theory, how, then, are my personal experiences? By and by good I can say. Initially, the finger did himself hard in minimally-biased springs and had quickly pain in his paw, but something you generally recorded under adjustment period. Since one and a half weeks I use the Varigrip now in bed at night front of the telly, in the lunch break, go ... General precisely where you can fire up the times Klampfe including Splicing not level (ie everywhere except in sweet home). Hand and fingers have gotten used to, especially the little finger acknowledged that additional training noticeably positive. As I said, I'm not going to blow by blow better, but have a soothing relief. Exactly what I had hoped for. No more, no less.
Is there at Varigrip also find fault? Yes, and the rubber stanchions are not particularly slip resistant. You can slip painful before, if you do not put on your fingers clean or they are greasy. This can, for example, with the stick encounter a small piece of sandpaper, which should also have the positive side effect of corneal promoting effect. Whether the slightly embossed on the back strings have this effect, I can not say. The second drawback is that the device eventually loses its raison d'être for daily use, the fingers are again strengthened enough, but that's one of the points which are vorrauszusehen.
CONCLUSIONS: not a panacea, but a useful supplement for beginners and people with rather small / schächeren hands. Not only for guitarists, but of course the (counter-) bassist, violinist, trumpeter, etc. The Varigrip could possibly be of interest to people who have to overcome the effects of a stroke. My uncle then had a hand exerciser just for this purpose in use.