I used to play in these ALL THE TIME. It was actually my preferred mode of playing until I had ran it up to a certain amount. While the $2 ones are the ones I've played most often, my favorite (and 2nd most frequent) is the big one at $40. I've never hit the "jackpot" where all 3 split the max. I've seen it on the board though. One time I remember (surprising because I was playing drunk) winning 3 straight 40s for either 120 or 160 and then the other 2 were 240. Having 1000+ in the account at that point playing $40 sngs seemed silly especially since jackpots are so infrequent and 75% are going to be $80 to winner.
Anyone can "say" anything, but here it is from the site:
4081395 Hold'em $40 Jackpot Poker $37.60 0.00 0.00 0.00 $1.80 0.00 0.00 0.00 $0.00 0.00 0.00 0.00 $0.00 0.00 0.00 0.00 $160.00 0.00 0.00 0.00 1/11/2016 8:15:44 AM 1/11/2016 8:15:57 AM 1/11/2016 8:25:10 AM 00:09:13
4083002 Hold'em $40 Jackpot Poker $37.60 0.00 0.00 0.00 $1.80 0.00 0.00 0.00 $0.00 0.00 0.00 0.00 $0.00 0.00 0.00 0.00 $240.00 0.00 0.00 0.00 1/11/2016 2:48:35 PM 1/11/2016 2:48:47 PM 1/11/2016 2:56:18 PM 00:07:31
4085359 Hold'em $40 Jackpot Poker $37.60 0.00 0.00 0.00 $1.80 0.00 0.00 0.00 $0.00 0.00 0.00 0.00 $0.00 0.00 0.00 0.00 $160.00 0.00 0.00 0.00 1/11/2016 8:42:28 PM 1/11/2016 8:42:41 PM 1/11/2016 8:53:16 PM 00:10:35
4083210 Hold'em $40 Jackpot Poker $37.60 0.00 0.00 0.00 $1.80 0.00 0.00 0.00 $0.00 0.00 0.00 0.00 $0.00 0.00 0.00 0.00 $240.00 0.00 0.00 0.00 1/11/2016 3:15:29 PM 1/11/2016 3:15:41 PM 1/11/2016 3:21:54 PM 00:06:13
btw, I don't consider these to be "big wins" but I was happy to get them.