Anyone have the TomTom Spark Cardio?

Anyone have the TomTom Spark Cardio? I got the Garmin 235 right after Christmas after using the TomTom Runner for a long time. I loved the Runner, but the current pace was absolutely horrible. I though the Garmin would be better and had a gift card so got the 235. It was OK - didn't love it, didn't hate it. But, it was a bit finicky. I didn't really have any of the major issues others did, until this weekend. It was really off this weekend (not registering sleep at all, not registering HR at all) and, the current pace didn't work any better than my old TomTom. Given the cost of this thing, it's going back to Amazon. To save $100, I can put up with the TomTom quirks. Anyone have the TomTom and can let me know what they think? I'm most interested in the running/workout features and likely won't wear it as an activity tracker (though I do enjoy sleep tracking)