No - probably not. There may be a few reasons for seeing a lot for sale. Main reason could be that the new models being released a few months back. The are not backward compatible so those upgrading are probably selling their older models.
They work. They move a lot of water. They are the only pump on the market that allows you to switch a configuration and move water in a different direction. They offer decent manual programming to generate some good flow patterns. However, they are also a bit tricky to clean, are not 100% silent, more parts to clean and reassemble, and when used in a tank that is relatively new or does not have mature coral growth, well, adjusting the proper flow rate and patterns is dang near impossibly. This also includes placement both in tank and unit itself. They are large.
That being said I owned a pair of XF250's and found them to work well. However, the recent upgrade, lack of backward compatibility with the new controller, lack of decent and affordable integration with Apex, and most importantly not being able to create a nutrient transport wave patterns I've since taken them off line. I'm a lot happier without them now and I never really paid attention to the size of the units until after removing them. They are really large...
I may reintroduce them in a year after some corals grow in size but in the meantime I've removed them. Believe it or not I found that I had better control of wave patterns throughout the day with a pair of Jabeao pumps and my reef angel controller. Tidal swell, reef crest, nutrient transport, etc. Similar to what the vortech's offer with regards to wave patterns. Gyre is ok but I missed the other patterns and ease of applying power, etc.
Your mileage may vary of course.