I purchased the 8300ST Duxtop model a few months ago and I have good luck with it. I bought it on Amazon for 89.99. I used it to brew several 2.5 gallon batches. I found that my stovetop can heat up the water and wort faster than the induction burner, but I like the convience of just being able to plug the burner into any 120V outlet including in the basement during winter brew days.
I just did my first brew on an 1800 Watt Max Burton 2.5 gallon and it went fairly smooth held temp pretty good during mash with lid on and I kept the heat on low. Takes some time to get to Boil but overall not a big deal. Also remember you will need an induction ready pot. I got a 20QT at target for 49.99
One more thing to note is the boil is not going to be the massive boil you get from the propane burner but it does get a rolling boil I think next time I am going to add insulation outside the kettle.