I use a Winglock delrin and really like it. Deep and goosey. I prefer delrin over the other materials because the tone doesn't change with the weather like wood will and it's pretty much indestructable.
The sudden impact is a higher pitched call than most of Rick's calls....some will tell you it's more of a comp. type call.
The longneck lineup is supposed to be louder, a little deeper pitched and very easy to operate.I haven't got a longneck.....yet.
Customer service is as good as I've seen from anybody and better that most. E-mailed Rick to ask about getting a couple of spare reeds for the delrin and he sent me 5 reeds for it along with 4 sets of reeds for the double duck call he also knew I had....all at no charge
The delrin was my first real short reed and I found it very easy to learn with.Buy a Winglock and you won't be dissappointed