Is it possible to pick up the right saw for you by actually seeing its specifications, I mean if you have not used them and neither there is anybody who has had the first hand experience with the product....
I'd say more of a 'shot in the dark' . . .
Specifications can be misleading: displacement (cc's), HP, bar length, etc. do not tell you how reliable a saw is, how easy it starts, how it balances, how smooth it runs, parts availability, etc., etc., etc.
You can use some of those specs to narrow down the type/size/models saws that you want to look at. Trying them yourself is a great thing to do if you can. If not, you should seek out the opinions of others that you trust/respect. Certain saw models stand out in each category - even the manufacturers cannot always predict this!
If you are talking about some 'no-name' saw, sold on-line, using specs to compare themselves to a mainline saw, I would be skeptical; they are probably only quoting favorable specs. If it is a new company that has a local dealer who is willing to back it, that might be a different story, but I would still want to try it.
Philbert