I've used & tried a lot of calls over the years, including Tim Grounds offerings. The truth of the matter is all of the short reeds built by folks like Grounds, GK, Performance Calls, Winglock, and so on, are darn good to outstanding. Pretty much all also recognize the value of and practice excellent customer service.
I personally find Grounds calls tougher to work than others, particularly the lower priced poly carb model sold off the shelf (not in the display case with the top end acrylics) at places like Scheels & Cabelas. I've tried this model several times and just didn't like how much back pressure I needed to get it to sound good (getting correct back pressure is a helluva lot easier standing on two feet than laying down in a blind). Also found it difficult to reduce volume to do soft moans & clucks with this call. For that reason consider it a call for a moderately skilled to experienced caller. Good calls, but not one I recommend for a novice or as a first call for someone to learn on. In all fairness, Grounds top end calls are tough to beat, though...
Far & away the best combination I've come across for sound, ease of use, range, and price are those offered by Winglock. Even though I have & use top acrylic calls from a number of companies and switch around depending on conditions, the one call I always have with in the field is a Winglock Walnut Short Reed which costs around $40...