Hey, I just got the same heli yesterday. I LOVE IT. You will not be dissapointed. I ordered from the same guy, I don't think it comes with two lipo packs though, it shows one lipo and one nimh. I own a Raptor 50, so I am already experienced at flying. The HB2 is the best RC purchase I've made based on price spent vs fun. I've already put about 20 full flights on the HB2 and its holding up great.
Just make sure you know the basics of maintaining lipo packs: Don't let them discharge too far, don't keep them connected to ANYTHING(including charger), and keep them in a fire-safe container when charging, etc.
If you did get the one that includes a nimh, I wouldn't count on using it much. I can't get the heli to raise out of the ground effect with that 8.4v nimh pack. The lipo works great though, and has long/strong flights and great dischrge curve.
It is amazingly stable, and I am not exaggerating when I say when its trimmed properly it will basically hover itself. It handles moderate wind easily as well.
I took it to the park today to try out its aerobatic abilities. It has plenty of power to do a loop and go inverted, but with my current "ratio"/gain settings on the gyro it will not hold the tail well when you pull back to flip inverted, so be prepared for the tail to whip around a bit when applying throttle quickly. I'm going to try to tweak with the gryo settings and see if I can improve it. The heli handles great inverted as well. I hit the tail blade numerous times while trimming it and the blade and gears aren't showing any wear. Once I got home I took the flybar weights (collars) off and it seemed to improve cyclic a bit, I can't wait to try out some aerobatics and see how it has changed.
I did get a bit too zealous and started flying it like it was my R50 and crashed it though. I broke the main wooden blades and chewed up a tooth on the main gear. Since I didn't want to quit, I repaired it with some thick CA and some thin balsa to reinforce it untill I can get a replacement.
As you have noticed, I absolutely love my ESky HB2. Now, I KNOW it isn't as good as a T-Rex, Shogun, etc. but not everyone needs one. I already have an R50 to fill my hardcore 3D needs and I was looking for an electric to fly around when I couldn't get to the field. I was prepared to pay around $250 for a fp heli that handled horribly. Needless to say I'm thrilled I found the CP HB2 that has moderate aerobatic capabilites, handles great, and is a measly $160 COMPLETELY RTR.
Just keep in mind you MUST have the throttle and trim all the way down, and the 3D/Normal switch is set to Normal before you connect the battery or it will immediately start spinning the blades and most likely chew up the gear and break the blades when it hits your arm. Not to mention it might hurt a bit.