If the bike fits- and it can be pedalled- buy it.

The first bike is never the one you stay with so that first bike has to be ridable. If it doesn't fit-too hard to ride- hurts the back after 5 minutes and it will be sold next year and not replaced.

Same on the bike for you.

Once you have got fit(ter)- got over the butt ache- done your first 25 mile trip and THEN found that the bikes aren't really suitable- decide what you do want and go and look for new bikes.