Second the collective modes generally have only a fraction of the total spectra weight. Third, due to the part of the excitation spectra at thermal frequency, the role of inelastic scattering due to real as opposed to virtual scattering in pair-breaking is stronger for finite ℓ pairing. The gain in T$_{c}$ from e-e induced superconductivity of a larger characteristic energy giving a large prefactor is thus mitigated and special conditions are required for a substantive T$_{c}$ . The empirical results on e-ph promoted superconductors, and on classes of e-e super- conductors: liquid He $^{3}$, Heavy-fermions, Cuprates, Pnictides and Valence-Skippers is re- viewed in light of the discussions summarized above. I will explain how we understand semi-quantitatively that the maximum T$_{c}$ is only an order of magnitude lower than the cut-off frequency for e-ph superconductors. This is also about the upper limit obtained for the attractive Hubbard model with the same cut-off. For liquid He $^{3}$, the lower value T$_{c}$/E$_{f}$ of O (10 − 3 is understood from the coupling constants obtained from the appropriate gener- alization of measured Landau parameters as due to the larger reduction from self-energy, the reduction of the cut-off frequency by the large renormalizations and the fact that the collective fluctuations have only a fraction of the total weight of the fluctuations given by the sum-rules. We gain a factor of O (10) in this dimensionless ratio both for the heavy-fermion super- conductors as well as the Cuprates and nearly that for the Pnictides. This is undoubtedly related to the empirical results emphasized in this overview that that high T$_{c}$ in Cuprates, in Heavy-Fermions, the Pnictides and the Valence-Skipper is related to proximity to a qcp of unusual variety. As noted, quantum-criticality of the Gaussian kind is deleterious for T$_{c}$ because it reduces the cut-off in the fluctuations and promotes pair-breaking through inelastic scattering. The unusual nature of the fluctuations responsible for the relatively high T$_{c}$ of Cuprates and (in dimensionless terms) of the heavy-fermions is that the spectra though critical is distributed over a wide frequency range and that it is nearly momentum independent. The former leads to lower inelastic scattering as temperature decreases while the latter gives the smallest ratio of ℓ = 0 to finite ℓ coupling constants. For Cuprates direct evidence also shows that the cut-off frequency of this unusual spectra is only a factor of about 4 below the fermi-energy. The derivation of the spectra for the relevant qcp for the Cuprates [9, 10] relies on the discovery of an unusual competing order parameter in the Curpates. It is shown that the Action for the model can be written as a product of orthogonal topological variables, one 10