Hi, crucifycheng.  I had a Boss ME70 for almost two years and to be perfectly honest with you I didn't like it too much although I tried to. I was never completely happy with the tones that I got out of it and spent a lot of time "tweaking" to try to get there,it wasn't terrible but the POD HD does have far superior tone. I found the Boss ME70 to be quite 'noisy'  I mean well beyond the typical single coil noise-it actually made my Les Paul sound like it was humming and buzzing.  After having iit for about 20 months (from Sweetwater Sound-they have their own two year gaurantee on products that you purchase from them) I contacted Sweetwater about it and they sent me out a brand new one, but it sounded the same. It does have a noise reduction feature on it but even maxxed out it still made lots of noise and robbed me of tone and volume. I even ran independant grounds to the metal chassis but even that didn't help. So back went both ME70's and eventually I ended up purchasing the POD HD 300.

I do like the POD HD 300-so far. It has great tone. I haven't downloaded the updates or Firmware (or even the Line 6 Monkey) yet, because it seems that they don't have the bugs all worked out of that yet and I'm considering waiting for the next (anticipated) update. Line6 does not post any information about when any updates might be coming out nor what these updates contain, but apparently that is how Line6 chooses to play the game. Personally, I don't think that the POD HDs were ready for market and shouldn't have been released when they were. I think that they should have waited until they had a fully and properly functioning unit and a support base in place before release, but I guess that's just my opinion-take it for what it's worth.

Like I said, I think that I like the POD HD alright, I just don't like the way Line 6 operates.  This is my first Line 6 product ever  (and I have an entire studio's worth of equipment and enough for nearly two bands-and I've been playing for 43 years-so I'm no newcomer).  This-my first experience with Line 6 has definately been a memorable one but not a good one. So you might want to take a chance and stick with the POD HD.  If not, you might want to check out the VOX Tonelab LE  or even the Tonelab ST(less money). I've heard and read some good things on those.

Last but not least-the Rumor Mills have it that the BIG MANUFACTURERS-Boss(?), Digitech, Zoom and a couple of others are all about to release new versions of their Multi-FX pedals (and amp sims) in direct competition to the Line6 POD HDs.  So, I believe that there are some very interesting things about to happen in the very near future.

ALSO-keep an eye on Fender-they are hot and heavy on the whole modeling-sim-fx bandwagon. Check out the new Fender Mustang Amplifiers-WOW! The Fender Mustang v amp head-150(stereo) watts for $299 and a STEREO 4x12 cabinet (with specially voiced modeling speakers) also for $299--THAT'S 150 WATT STEREO HALF STACK WITH OVER 100 PRESETS (amp models)AND OVER 37 EFFECTS---ALL FOR ONLY $598. (not much more than a POD 500). They also have 20 watt, 40 watt and 100 watt versions available.

Don't let the Tube Amp Tone Snobs sway you...if they all had such wonderful Tube Amps then WTF do they need to be modeling them for?   I find that the POD 300 delivers a pretty convincing tube tone into my solid state amp and if that weren't enough I'd just run into a tube preamp, but that isn't necessary with the POD HDs, in fact I probably would NOT recommend running into a tube preamp.  Good Luck with your quest and remember-half the FUN is the research and the shopping for new equipment.

BUT I'm just a guy with two quarters stuck in the Dollar Store.