I was sitting in my apartment in PA using this application for the Daytona race last night.
Delay or not it's still absolutely amazing to sit on my deck and listen to Jeff Burton's in-car radio. Not to mention choosing from who ever else I want to check out.
I was using my WiFi connection at home and there were plenty of times there was barely any delay, but then there were times (like on a restart) where it was about a half to a full lap off.
My main gripe with the thing is that once your screen locks the application stops working. I turned the brightness down, and with off and on use through the race it only chewed up about 25% of a 75% charged battery. So that's not horrendous. But again I didn't run if for the full 160 laps.
Ultimately if you're at the track I don't how much better the performance will be. I'll be testing that out at Pocono at the end of the month.
I'm going to think it safe to assume that your best bet is to stick with the actual scanner. And if you only go to one race per year the $35 bucks isn't too bad a pill to swallow. If you plan on going more than that you'd likely want to pick up your own equipment.
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But as it regards the NASCAR application on the EVO its awesome when you are sitting at home, a thousand miles from the track, and getting in-car audio.
Now if only Burton and the 31 team can get it together and win some races. It just stinks being at the front every time out, and having something go wrong in the last 20 laps.