SoundMagic were good value but increasingly less so. The price of becoming more mainstream. I wouldn't pay this price for this model, Sony makes better at this price level. Comparison to an open back Senn 500x series is irrelevant.
User reviews can be very subjective, so independent reviews are better I feel. Another review here: http://www.hifiheadphones.co.uk/reviews/soundmagic-vento-p55-closed-back-headphones-review/ "Music genres good for and why: TheSoundMAGIC Vento P55 excels at dance music, funk and Hip Hop, while its strong midrange suits genres such as classical and jazz particularly well."
Reviews are funny things. I own a set of £300 Blue Mo-Fi's which I got cheap because the person selling them did not know what they were (estate sale). They sound astonishing but What Hi Fi only gave them 2 stars out of 5. This surprised me as to me they sounded a lot better than the cans they had given 5 stars to which I also owned. I take reviews on board when I read them but it is a good idea to read a lot of them rather than just one or two to get a better overall opinion.
So, my point is to get opinions of actual users!!!
I suggest you go read a few back issues of either mag; they DONT give much, if anything, negative in their reviews for ANYTHING by a major manufacturer; it is usually piddling little things like the control button being 1mm left of where they want it to be; anything even mildly critical of sound quality is either for no names, or when sound quality is AWFUL. I came across this myself back in the 90's, a raving review for an over-priced CD player neglected to mention that on any decent, revealing speakers, you could hear nasty artefacts in the upper registers caused by the cheap ,n nasty DAC they had fitted; and even today they praise the LP12 to the roof, whereas my experiences were that even modestly priced TT could and did sound better. My then £350 Manticore with RB300 and Ortophon MC20 sounded so much better than my step fathers RP3 that he went out and spent £1000 on a LP12/Basik, and when that didnt make enough difference, another £1000 on an arm/cart upgrade, and when THAT didnt make enough difference, another £1000 on the upgrade kit. He was infuriated when my modest set up still sounded better, and then spent god knows how much on speakers and pre/power amps, easily in excess of £5000. All of this stuff got rave reviews, whereas my kit, from relatively small outfits got "good for the price", bass heavy", too much top end" etc reviews. it is lucky for him that I had to sell the Manticore (I hate the CSA), or he would be bankrupt by now.