Thanks for sharing this.
I've got 2 questions:
1) I've also found the HT500:
Contractor Grade Gun Foam - HT300, HT500 Handi-ToolŪ Dispensing Unit (look on the specifications tab)
The only difference between the 2 is the 500 has a "narrowed" barrel as apposed to the "smooth" on the 300. Also, the 500 has a "teflonized basket".
What is the bennefits of these upgrades? Would the 500 be worth the extra few dollars?
2) Will this gun accept the Great Stuff Pro can?
Thanks!!