I purchased LockInfo back on iOS3 and was thrilled to jailbreak my 4S so I could run it again. Nothing like missing calendar events, having to open Mail.app just to mark things as read, and forgetting about Reminders to make you realize how lame iOS5 notifications were when one guy did it right back on the iPhone 3GS and Apple still hasn't caught up.
LockInfo is better than ISX on the main page (just due to being a bit better coded I think), but the extra pages with Twitter and Facebook make it more worth using ISX to me. Also the way it handles RSS feeds is brilliant, opens right into the Reader style of the article. Using Reader on Safari is nice when I feel like it but usually I just want to read the article there instead of loading up the article...again, so I sacrifice a bit of readability. Kudos to the ISX guys for implementing it that way.
I tried running both at the same time but it broke some of the NC widgets such as WidgetTask so I had to take one off, worked otherwise though!
My issues with ISX are as follows (mostly due to comparing to how LockInfo handles things):
1. Facebook feed shows Farmville!! ARGHH! I was thankful when the Facebook.app was smart enough to ignore the same things that I set on my PC feed, but I don't want to have to open that app just to check the feed. I imagine it's because of how Facebook's API is set up but I hope there is some way they can work around it.
2. The WidgetTask widget opens the app but leaves the NC down so I have to hit home to clear it and see the app. LockInfo handles it by unlocking the phone and going right to the app, which is proper.
3. Hitting X on new mail does not mark as read, only clears the NC notification similar to how the stock NC works, which is bad. I am hitting X because I want to mark it read. Having to preview the mail first and then hit mark as read is an unnecessary extra step. LockInfo does it right by clearing and marking as read with one hit of the X.
4. I noticed both LockInfo and ISX introduce some delay on pulling down the NC, usually 2 seconds which really starts killing the smooth feel of iOS. Stock NC makes you feel like you are immediately pulling down the Notification shade, whereas LockInfo and ISX feel more like activator actions.
Most of my comments are splitting hairs which goes to show how great a job these guys did. I hope that David Ashman will fire back at Intelliborn and add multiple paging and the social networking/RSS stuff as well. I'm not sure how long I have left on the trial but I will most likely be purchasing ISX as well.