I have done a total of 7 magnetic conversions so far with some highlights and some mediocre.
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List:
2x2 Kung Fu (N38 3x2mm)
3x3 Weilong GTS x 2 (N35 4x2mm)
3x3 GAN Air (N35 4x2mm)
3x3 Valk 3 (N35 3x2mm)
4x4 Yuxin Blue (N35 4x2mm & N35 3x2mm)
4x4 QiYi WuQue (N35 4x2mm & N38 3x2mm)
The best of these ITO what the magnets do for the cube are the WuQue, GTS, and Blue. The ones that are a little too weak are the Valk and Kung Fu. The GAN is too strong IMO.
The WuQue is the standout though. It is simply an amazing 4x4 and with the magnets it is just that much better. Definitely my main over the Blue M, which is also made that much better with the addition of magnets.
I'm interested in looking at doing a 5x5, just not sure which way to go with the magnets. A complication of that is the availability of magnets which I've been buying off of eBay. They take 2 months to get here. I did find a local magnet supplier, but their stock is limited in the sizes and strengths needed to do cube conversions.
I must say that I have been enjoying the whole magnetic conversion process, even the ones that didn't turn out as well as I had hoped. Trying to sell those ones now to fund replacement cubes that I can try other magnets in.