I finally received my respro mask yesterday. I ordered it a few days
ago from their website (www.respro.com).  It was shipped to me from
the UK.  The whole thing including shipping burnt a hole worth 33 UK
pound sterling on my credit card. There was no customs duty levied on
it by the Indian authorities. It was shipped to me via. Royal Mail.
The packaging was excellent. I ordered the techno model (blue colour,
large size). I got to try it out this morning cycling for about 5 to 6
km.  Here is my initial impression of it:-

1. Just like the totobobo mask it forms a tight fit over the nose and
mouth. It is very easy to put on and take off. Very convenient. On
this front it does have a slight edge over the totobobo mask.
2. It seems to be as effective as the totobobo mask in filtering out
the sub micron particulate matter in pollution. And in addition it has
two one way valves on it which ensure that as you breathe out, the
water vapour in the breath goes out without condensing inside or
without leaving a temporary cloudy layer on my spectacles. Because
these are one way valves, when you breathe in, they lock up and the
air passes only through the filter inside the mask.
3. The filter has a Dynamically Activated Charcoal Cloth (DACC) in it
which adsorbs (note this is not absorption but adsorption) which is
supposed to protect you from gases like CO and other gases in typical
vehicle exhausts. I was very keen on testing this aspect of the mask
as the totobobo mask does not have this feature. With the totobobo
mask I can smell the exhaust quite clearly and they anyway do not
claim that it protects you against gases in the exhaust.  Totobobo
does claim that the mask filters out particulate matter (upto 94% i.e.
1% less than the N95 NIOSH standard) upto 0.3 micron size (i.e.
anything greater than 0.3 micron size).  As I mentioned in my earlier
review of the totobobo mask, the filters turned black for me with 2
hours of usage. BTW I got totobobo on their website and it was shipped
to me from Singapore. Back to Respro mask now. The acid test for it
was going behind a bus which just accelerated from a bus stop.
Obviously the bus spewed out a ton of exhaust at that point. I could
not smell the exhaust a bit. I just could not believe it. The damn
thing is very effective and respro's claim, at least for me, seems
vindicated. I can't say the same about totobobo. Hats off and thank
you respro.
4. According to respro, the filter is expected to last for 30 hours at
a breathing rate of 30 liters per minute assuming WHO guidelines for
ambient levels of pollution. I don't know how many times is the
pollution in Bangalore compared to WHO standards. Surely that factor
must be more than 1. I intend to use my respro and keep a record of my
usage to see how long a filter lasts in the pollution levels we have
in Bangalore. BTW the replacement techno filter pack (2 filters in the
pack) will cost you 16.5 UK pound sterling including shipping to
India.
5. I was of course sweaty inside the mask but surely a lot less than
the totobobo mask because of the one way exhaust valves.

I agree respro is very expensive (4 times almost) compared to the
totobobo mask. I will post more about my feedback on respro after I
use it for a few weeks.

Cheers
Nagaraj