I just imported a Vita TV, since I was able to get one for about ten bucks more than the U.S. PSTV is going to cost next week and American accounts now work. Here's my initial impressions.
-The Vita TV is a lot smaller than I expected it to be. Seriously, it's so tiny-- my phone is bigger than it is! Things also look a bit messy when you plug all the cables into it.
-More Vita games were supported by the Vita TV than I thought. All the games scaled pretty well, but the best-looking titles I tried were both Senran Kaguras, Muramasa Rebirth, Sonic Transformed, One Piece Kaizoku Musou 2, and Toukiden. The picture quality is overall fantastic and some multiplatform titles looked extremely close to their PS3 counterparts.
-Could not figure out how to use a PS4 controller with the Vita TV and had to use a PS3 controller to test remote play. The lack of a touch pad made it hard to get some stuff working. I'm sure there's something very basic that I'm missing.
-Tried both my Japanese and American accounts. Account switching is easier than on the Vita since the stupid introduction video does not play, so the process goes quicker.
-The American PSTV store is not up yet, but once you activate the system, all your DLC will work.
-On my American account, the Japanese Vita TV information screen still displayed, but everything else was in English. Am wondering if this may cause an issue with streaming apps and U.S.-specific media content.
-When I inserted a memory card, the Vita TV did not keep my folder settings, background images/themes, and like what happens when account switching on a Vita, some game icons disappeared and had to be "reloaded" by inserting the game cards. Fortunately, however, when I put the memory card back into my Vita, everything was intact, so the Vita and Vita TV save these profiles separately. This means if you have both, you'll just need to set everything up on the Vita TV one time only.
-Not sure about remote play yet. I tried this in the bedroom and the wifi signal is not as strong there. I do have a signal booster packed away and may set that up this weekend, to see if it improves things. I was able to play Sengoku Musou 4 for a bit. It looked decent, but was clearly lower resolution and that 30 FPS limit was much more noticeable on a larger screen. I think on competent connections, remote play will really depend on the game.
-It's really nice having full-screen PSP games. I may buy some more titles now, although Persona 3 Portable looked kind of ugly when enlarged that much.
-Have not had a chance to try PS1 games yet.
EDIT: Updated list of games I've tried-
Supported:
-Killzone Mercenary
-Sly Cooper Thieves In Time
-Akiba's Trip
-One Piece Kaizoku Musou 2
-Dynasty Warriors 8 Xtreme Legends CE
-Shin Gundam Musou (J)
-Sengoku Musou 4 (J)
-Deception IV
-Senran Kagura Shinovi Versus (J)
-Dekamori Senran Kagura (J)
-Dragon's Crown
-Chou Jigen Action Neptunia U (J)
-Bullet Girls (J)
-Ultimate Marvel Vs. Capcom 3
-J-Stars Victory VS (J)
-Blazblue Chrono Phantasma
-Arcana Heart 3 Love Max!!!!! (J)
-Dead Or Alive 5 Plus
-Divekick
-Sonic Transformed
-Toukiden
-Muramasa Rebirth
-Ragnarok Odyssey Ace
-Magical Beat
-Spelunky
-TxK
-Jet Set Radio
-Musou Orochi 2 Ultimate (J)
-Retro City Rampage
-Ninja Gaiden Sigma Plus
-Soul Sacrifice Delta
-Final Fantasy X-2 HD
-Rogue Legacy
-Pix The Cat
-Malicious Rebirth
-Persona 4 The Golden
-Persona 3 Portable (PSP)
-ClaDun (PSP)
Not supported:
-Ninja Gaiden Sigma Plus 2
-Unit 13
-Borderlands 2
-Hotline Miami
-Phantom Breaker Battle Grounds
-Street Fighter X Tekken
-Rayman Legends
-Ridge Racer
-Hyper Dimension Neptunia Re;Birth 1
-Hot Shots Golf World Invitational
-Virtua Tennis 4
-Hatsune Miku Project Diva f
-Guacamelee
-Shinobido 2
-Uncharted Golden Abyss
-Metal Gear Solid HD Collection
-Mortal Kombat
-Injustice
-Gravity Rush
-ACIII Liberation
-Wipeout 2048
-Olli Olli
-Lumines Electronic Symphony
-Castlevania The Dracula X Chronicles (PSP)
-Metal Gear Solid Peace Walker (PSP)
So, should you buy a Playstation TV? Depends. Are you big into Vita gaming? It's worth it if so. Are you interested in it for remote play? You may want to hold off for more impressions then. Even with a better connection, you are going to be playing PS4 games at a lower resolution and (depending on the game) half the frame rate. Even if you've tried remote play on a Vita, it's still a bit of a different experience as the flaws in the stream quality are much more apparent on a TV.