I am going to be brutally honest, This was my idea as well, dump Big Red and their bloated prices and go to a simple $50/month... I am there but it had it's bumps and I had to give up my Rez...
I have tried multiple current ROMs with Net10 and StraightTalk GSM SIM cards (all AT&T) including Infection, Liquid Smooth, CM, Beanstalk, and PAC-MAN, and never been able to get better than Edge 2G speeds (220Kbps rated, actual is MUCH lower), I cannot get HSPA to even connect no matter what I do, tried the NV edits, multiple APN settings, etc. and no luck. I know others have been able to get this work (why would they lie?), but I finally gave up and bought a like new unlocked AT&T Samsung Galaxy S2 Skyrocket on eBay, popped in my Net10 SIM, set the APN, and it just works, no LTE but then again I never expected it to work, but HSPA+ works beautifully. (Now, GPS on this device is questionable, but that's a different topic entirely).
Bottom line, Net10 works great on the Rezound as long as all you need is voice, text, and the occasional small email or mms message and you have patience.... but for anything more it is painfully slow. Sending or receiving an mms message on Edge can take several minutes per mesage and browsing the web is virtually impossible without WiFi, much less trying to stream audio or watch or Youtube video.
Current Personal Phone: Google Nexus 4 (KitKat 4.4.2 KOT49H/AT&T GoPhone SIM)
Current Work Phone: HTC Rezound on VZW (S-OFF/CarbonROM
Current Tablet: iPad 4 and Nextbook 8 Premium with marxo's N8+ ROM - Revision 1b2 (ICS 4.0.4)
Previous/Retired Android Devices: HTC Aria, HTC Incredible 2, Samsung Stratosphere, HTC Rezound, Samsung Galaxy S2 Skyrocket