Joe,
The gel products are still often a go to for homeowners and many companies.
Some caveats include:
Need to reapply so must factor in how often and using the lift etc...in this case for access.
Pigeons generally seem to laugh at this stuff made by anyone on the market right now. Might avoid it for
a bit but generally not for long in my area.
I've never installed it or recommended it as the first houses I saw with any of these applied were permanently
stained stucco that made it look like you tagged it with a black line all over the ledges and ridges often bleeding
over onto the sides of the exterior where obvious to public view.
The gel usually becomes piled with droppings, feathers and dust, dirt until ineffective.
Many companies switched up their gels and have said they don't cause this problem anymore but I'll never go near them
for this and the other reasons listed.
They also are on a hit list for many bird rescue organizations and rehabbers. Last year I saw a gallery posted by one upper Midwest state rehab center that had all manner of protected bird life showing how the gels had impacted them. Not good.
Today I'm heading out to quote a pigeon exclusion and another franchise (not wildlife), utilized the sticky foot on her home and it all turned black causing that typical damage I mentioned. Her house is probably 5 times the value of my little tract home and she was beyond angry.
I see it used often just thought I'd post what I've seen in terms of the negative, I'm sure folks are using it successfully but the pest control model has to be applied where you'll be coming back to refresh the stuff at intervals and associated costs etc....
Best,
Justin