yeah. etonic had a variable adjust heel.. VHA.. I think you could change the angle of the heel to make it brake more or less..
they scrapped that plan a few different times..
I stayed away from etonic for the longest time because of the non interchangeable heel and the stories of some of their earlier shoes leaving rubber residue on the approach.. I finally broke down and bought a pair of the E-PRO ESS interchangeables and the shoes work perfect for me.. I tried dexter and 3g and could never get the right sole / heel combo.. somehow the static heel on my etonics works great for me and has worked at every house I have bowled in.. Atleast 6 or 7 different houses..
guess I got lucky.. but yes.. I would love to see an interchangeable heel.
I believe etonic has the best push off tech of any shoe..(not sure about the SST8s, haven't tried them yet) My SST6 and 3g soles would slip and squish on the push off shoe..just didn't feel stable..
I will say that that I did not like the stabilite pro etonics.. shoe was just too big and bulky at size 14..
--------------------
18 mph,350 rpm,PAP 5 1/2 x 3/8up, 15 deg axis tilt, varied rotational axis deg.. usually 45+
HighGame 300 x 4, High Series 808
Book Average 220,PBA Xperience 185