Not for me. Speed hasn't been an issue. If anything, the output for web of PanoramaStudio 3 Pro loads much faster because it starts displaying the image immediately, rather than first waiting for all files to download. If I hadn't already purchased PTGui, I would exclusively use PanoramaStudio 3 Pro. It also has a wonderful mapping feature with hyperlinks between panoramas, and the developer, Tobias, is very responsive to all questions. I do, however, like the PTGui standalone viewer. I use it for all the Mavic 3 in camera created panos on my PC to see if they require manual stitching in PanoramaStudio 3 Pro.Looking at both. Big price differential and the only large differences I see in reviews are the speed of PTGui and its ability to handle HDR. Are those significant enough to warrant the $79 vs $315 price tag?