Resin? I wonder if they'll be strong enough for monofilament?
Personally, I find that they look just a little too big on a model - the 1/48 just looks better, to my untrained eye, on a 1/32 model than the actual 1/32 turnbuckle.
I quite like photo etched buckles, like Eduard and RB Productions. Works out cheaper than Gaspatch, I think they look great and I feel like I'm doing a bit more actual modelling, instead of cheating with the Gaspatch pre-made buckles!