I have the i9200 and get hspa+ speed of about 11-12mbps download and about 2.5mbps upload on t-mobile in nyc. I also have an at&t galaxy note lte unlocked that I use on t-mobile and get about 20mbps down and 10mbps up. I tested the internet speeds on both devices in my everyday usage (live streaming, internet surfing, email, etc.). Seems like whatever streamed smoothly on the galaxy note while on lte also streamed smoothly on the galaxy mega on hspa+. When something buffered on the mega while on hspa+ it also buffered on the note while on lte. They basically performed about the same in my everyday usage. My goal was to see the difference between lte and hspa+ on t-mobile.
I was seriously considering getting the i527 (unlocked so i could use it on t-mobile) just for the lte but I'm not sure it will be worth me spending the money. The only time I really saw a difference between hspa+ and lte on t-mobile is with Speedtest (which isn't real life usage but just the app i used to test the internet speed on both devices) and downloading very large files. Downloading large files took noticeably less time on lte. I don't download or upload large files on a regular basis so that's not an issue for me.
Fyi...I went to an AT&T store to try out their i527 on their lte network. The internet speed seemed slower than my i9200 on t-mobile's hspa+ network (both Speedtest and surfing/streaming). I thought it would have blown my phone out the water. I was NOT impressed. Also their locked, unrooted and bloated i527 seemed laggy compared to my unlocked, rooted and unbloated i9200. I haven't had the opportunity to test a rooted unbloated i527.
I got my phone when it first came out a few months ago and have not ran across 1 person yet with any version of the mega. Strange since different carriers have versions of this phone plus the unbranded versions that have been out for a few months already.
Sent from my GT-I9200 using xda app-developers app