The instant HPW has been in use for a bit now or course nothing is better than the Original HPW the instant is a much more proper diet than pellets since it is more nutritional sound and mimics the nectars a glider would have eaten better than pellet diet.
I haven't used the Instant HPW because is use LGRS but I haven't heard anything bad about it yet like I have HPW Complete. Maybe someone that has tried it will come along.