1) Battery life doesn't bother me too much. I keep it plugged in 95% of the time and when it's not, I don't need to use it for more than 2-3 hours anyways.
2) My wifi has not had any problems. It connects right away on start and never disconnects or loses connection. Bluetooth works great too. I use a BT mouse and keyboard with it and both connect and download drivers automatically. They never lose connection and I can plays games (FPS) with it consistently. My only problem is the mouse lags when sending large files through wifi, but from what I know, it's a problem with the mouse and not the SP. Other users with the same mouse experience the same thing on their laptops/computers.
3) Personal preference I guess.
I keep mines plugged in majority of time also. because I like to put powermode on Performance. where it seems to run at over 2.2Ghz the majority of the time. goes even higher.
I do wish I would've got the surface pro when it first released. ive had my 128gb for around 2 weeks or so now. I absolutely love it. it was an expensive purchase. when I went to get it, I was undecided. it cost so much and i know i wanted it but wasn't sure of spending all that on it. so i bought the new nexus 7 instead. got home and used it. all i kept thinking about was the surface pro. i was using the N7 to still research and watch vids on the pro. like an hour or 2 passed and i took that new nexus 7 right back and returned it to bestbuy. then i got the pro along with type cover. i got type cover on a deal since it was a display model one. saved $30 on that. went home and ive been more than impressed with my device ever since.
i will admit seeing negative posts or ones about newer more powerful ones or better deals gets me thinking. but i looked at tons of reviews and videos on competing devices with similar form factor. yeah some may be more powerful, the i7 config like in helix, but overall the Surface Pro still shines. that Helix one is nice and all but its a lot heavier. plus that docking mechanism is atrocious. i do like it has a battery in the dock along with 2 3.0 usb ports. buts it way to expensive. the i7 config is a lil more than double the price of the pro. not worth it in my opinion. the tablet itself still gets same battery life as the pro.
A good review site i like to look at is mobile tech review. this lady is unbiased and does full detailed reviews and smackdown comparisons on youtube. ive seen several of the surface pro vs. some other competitor. in the end the surface pro still wins out. most of the other competition has a larger screen and a lot heavier. making the surface pro more portable.
like previous poster said, its personal preference. i have no regrets on my purchase. still learning new things about my device daily. i love the pro design. its very unique and high quality parts used. when surface pro 2 drops, ill likely get one and possibly give this one to my woman or dad. it needs to have better battery life and a big spec jump. or at least have same battery life with a major spec and possible resolution increase. either way, i have no immediate plans to part from the pro. it more than satisfies my computing needs. a nice surprise for me was how good of a gaming device it is. i never imagined id be playing Batman Arkam city or new Castlevania game on my pro. it plays those high graphic games well. i was use to playing android games..lol so this pc type gaming and the quality of games is on another level compared to android, apple , or even consoles.
id be willing to bet you pull out your surface and itll still impress people. i cant wait to go home this weekend for the holidays and show it off to my father.