I have read some bad critics regarding bpw and weight pockets?
So, I'm one of those people that's against pockets. I cannot STAND pockets to be added to BCD's. It makes them big, bulky, heavy, messy, and it makes it a pain to find anything. I would rather dive with an AL80 and no BCD than a BCD with pockets. However, BPWs with weight pockets can be had and are readily and cheaply available to those that want them. There are certain advantages to them. Trim pockets on your cambands are MUCH more acceptable to me than pockets near your waist. The owner of my LDS is a HUGE fan of pockets. He has like 8 weight pockets on his BPW (2 on each camband, and 4 on his waist). He uses two of the waist pockets for storing stuff other than weights. It really is whatever floats your boat.
aren't they kinda big/huge for penetration?
Exactly the opposite. In fact, if you keep it minimal and don't put pockets and crap on there, you'll forget you've got anything on you. The amount of equipment that is visible/noticeable in a clean BPW setup is impeccably low.
As for the cost, you can get a BPW for anywhere between $300 and $1000. No need to spend over ~$450, though. Also, don't worry about any padding....it is VERY unnecessary. Get a one-piece harness with no clips or padding. It takes about 15 minutes to "assemble" and quite a while to get adjusted JUST right....but it's VERY worth it once you get it. There's no need to get a singles wing with over 40# of lift. There's no wing that works well for singles and doubles. Backplate and harness brands mostly don't matter. Wing brands matter, but a lot of the "big names" in Rec diving represent very overpriced or low quality options in the Tech world.
As for "trying tech once".....I thought the same thing. To get to 60m will involve a LOT of training, time, practicing, classes, equipment and effort. A LOT more than you'd think right now. 60m requires (practically, let's not start deep air argument here) Trimix and a lot of deco. It's not something a rec diver can train for over the weekend or just follow a dive guide to. I was told long ago (about 18 months, but a lot of money, time, trianing, and practice) that there's no way to "dabble" in tech diving. It's a very high-risk portion of the sport, and has to be taken very seriously.