I used one stripping the hull and bottom on my 25 foot Lyman. I got lucky and borrowed one from a generous landlord and it lived up to it's claims. It is still a slow process and you pretty much work about a 1 foot long section of each strake at a time, but after a few tries, you get the rhythm down and it's easier than scraping or using chemical stripper. Due to space restrictions in my shop back then I could not roll this boat to do the bottom so using a chemical stripper and having drip all over me was not an option. Of course, sanding is still required but the bull work of removing multiple old coats was a lot easier. Even the copper bronze bottom paint yielded to the infrared remover.
I also tried it on the interior covering boards as they are a mahogany ply and you cannot sand too much before burning through the veneer. It worked very well in removing old varnish and poly that someone used. A pricey tool but if I needed to do this task again I would buy one.
1966 Lyman Cruisette 25 foot "Serenity Now!"
1953 Chris Craft Sportsman 22 foot "Summerwind"